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Definitions of timid on the Web:

* showing fear and lack of confidence
* diffident: lacking self-confidence; "stood in the doorway diffident and abashed"; "problems that call for bold not timid responses"; "a very unsure young man"
* people who are fearful and cautious; "whitewater rafting is not for the timid"
* faint: lacking conviction or boldness or courage; "faint heart ne'er won fair lady"