I’m looking for a word that implies that one intended to do something but then didn’t due to being afraid. Like someone who never asks out a person of interest because of the fears of rejection or loss of a friend. Hesitate is close, but to me it implies that the action will happen eventually, and I want the word to mean that the person never goes through with it because he or she is so afraid (its synonyms seem to have the same implications). Is there a word in English that means a complete failure to go through with something out of fear?
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I hope those provide some inspiration.