Faith in the purest sense, is the ceasing of resistance, even when there's no physical evidence, when the other evidence is present. -- the other evidence is physical, proof. Not feeding ourselves on what God hasn't done. Faith in it's purest form is the absence of resistance.

A connection from the soul to a higher power or a higher sense.

According to the Bible: Hebrews 11:1 "Now faith is the substance of things hoped for, the evidence of things not seen."

Believe in God. Because you will be a stranger he doesn't know.

Belief - like the tooth fairies etc...

Hebrews 11:1 “Faith is the assured expectation of what is hoped for, the evident demonstration of realities that are not seen”. Faith is a key part of our worship to God “without faith it is impossible to please God well, for whoever approaches God must believe that he is and that he becomes the rewarder of those earnestly seeking him (Heb 11:6).

"Faith is the assured expectation of what is hoped for, the evident demonstration of realities that are not seen.” (Hebrews 11:1) For a person’s expectation to be assured, he or she needs to have sound reasons for that assurance. In fact, the original-language word for the phrase “assured expectation” means more than an inner feeling or mere wishful thinking. So faith involves conviction that is based on evidence.

Great question! What Is Faith? HOW would you define faith? Some equate it with blind belief. Influential American essayist and journalist H. L. Mencken once called faith “an illogical belief in the occurrence of the improbable.” The Bible, in contrast, describes faith as being neither blind nor illogical. God’s Word says: “Faith is the assured expectation of things hoped for, the evident demonstration of realities though not beheld.”​—Hebrews 11:1. Given the different opinions about faith, let us consider the answers to the following questions: • How is the Bible’s definition different from what many refer to when they talk about faith? • Why is it vital that we develop the kind of faith that the Bible describes? • How can you build strong faith? A Title Deed and Solid Evidence At the time of the writing of the Bible book of Hebrews, the Greek term translated “assured expectation” was commonly used. It often appeared in business documents and carried the idea of a guarantee of future possession of something. Therefore, one reference work suggests that Hebrews 11:1 could be translated: “Faith is the title-deed of things hoped for.” If you have ever bought an item from a reputable company and then waited for it to be delivered, you have exercised that type of faith. The sales receipt in your hand gave you reason for faith in the company from which you bought the item. In a sense, that receipt was your title deed, your guarantee that you would receive what you purchased. If you had lost the receipt or had thrown it away, you would have lost the proof of your claim of ownership. Similarly, those who have faith that God will fulfill his promises are guaranteed to receive what they hope for. On the other hand, those who do not have faith, or who lose it, are not entitled to receive the things God promises.​—James 1:5-8. The second expression at Hebrews 11:1, translated “evident demonstration,” carries the idea of producing evidence that contradicts that which only appears to be factual. For instance, the sun appears to revolve around the earth​—rising in the east, moving through the sky, and setting in the west. However, evidence from astronomy and mathematics reveals that the earth is not the center of the solar system. Once you become familiar with that evidence and accept it as true, you have faith that the earth revolves around the sun​—despite what your eyes tell you. Your faith is not blind. On the contrary, it gives you the ability to see things as they really are, not merely as they seem to be. How Important Is Strong Faith? This is the type of faith that the Bible encourages​—strong faith built on solid evidence, even if it requires that we adjust our beliefs. Such faith is vital. The apostle Paul wrote: “Without faith no one can please God. Anyone who comes to God must believe that he is real and that he rewards those who truly want to find him.”​—Hebrews 11:6, New Century Version. For more information on this subject please visit jworg.

The word “faith” primarily conveys the thought of confidence, trust, firm persuasion. Faith is, therefore, the basis for hope and the evidence for conviction concerning unseen realities. The entire body of truths delivered by Jesus Christ and his inspired disciples constitutes the true Christian “faith.” ( Ac 6:7;) Christian faith is based on the complete Word of God, including the Hebrew Scriptures, to which Jesus and the writers of the Christian Greek Scriptures frequently referred in support of their statements. Failure to study the Bible hinders any development of true faith. Although church members may have Bibles, if they have been taught the ideas of men instead of the Word of God, they will lack real faith in God and his purpose. To solve life’s problems, they will be inclined to rely on their own ideas and those of other humans. Faith is a fruit of God’s spirit, and God gladly gives his spirit to those who seek it. (Gal. 5:22; Luke 11:13) So persons without faith are not seeking that spirit, or they are doing so for a wrong purpose or are resisting its operation in their lives. Many things influence this:

Faith is the bird that sings to the dawn, while it is still dark.

Surrender

Faith is the substance of things hoped for, evidence of things not seen. As stated in Hebrews 11:1

This is a great question, “ The Scriptures tell us: “Faith is the assured expectation of things hoped for, the evident demonstration of realities though not beheld.” (Heb 11:1) “Assured expectation” translates the Greek word hy·poʹsta·sis. This term is common in ancient papyrus business documents. It conveys the idea of something that underlies visible conditions and guarantees a future possession. In view of this, Moulton and Milligan suggest the rendering: “Faith is the title deed of things hoped for.” (Vocabulary of the Greek Testament, 1963, p. 660) The Greek word eʹleg·khos, rendered “evident demonstration,” conveys the idea of bringing forth evidence that demonstrates something, particularly something contrary to what appears to be the case. Thereby this evidence makes clear what has not been discerned before and so refutes what has only appeared to be the case. “The evident demonstration,” or evidence for conviction, is so positive or powerful that faith is said to be it. For more information please visit jworg

Ahhh...if only there were some easily-accessible online reference that provided a user with a thorough set of standard definitions for standard English words...

Having a strong belief or conviction that something is true, can be done or will happen.

The Bible, in contrast, describes faith as being neither blind nor illogical. God’s Word says: “Faith is the assured expectation of things hoped for, the evident demonstration of realities though not beheld.”​—Hebrews 11:1. At the time of the writing of the Bible book of Hebrews, the Greek term translated “assured expectation” was commonly used. It often appeared in business documents and carried the idea of a guarantee of future possession of something. Therefore, one reference work suggests that Hebrews 11:1 could be translated: “Faith is the title-deed of things hoped for.” For more information on this subject please visit wwwjworg

Definitions from Oxford Languages: faith, noun 1.complete trust or confidence in someone or something. "this restores one's faith in politicians" Similar: trust, belief, confidence, conviction, credence, reliance, dependence, optimism, hopefulness, hope, expectation Opposite: mistrust 2. strong belief in God or in the doctrines of a religion, based on spiritual apprehension rather than proof. "bereaved people who have shown supreme faith." That is the definition from the Dictionary. The definition I feel says it better is found in the Bible. Hebrews 11:1, Faith is the assured expectation of what is hoped for, the evident demonstration of realities that are not seen. NWT. Here is a link to a Brochure "Real Faith-Your Key to a Happy Life. I hope you find it interesting, one of the sections askes "What Is Real Faith?" https://www.jw.org/finder?srcid=jwlshare&wtlocale=E&prefer=lang&pub=rk