timid

Adjective
  1. Showing fear and lack of confidence (synset 300252675)
  2. Lacking self-confidence (synset 300340839)
    "stood in the doorway diffident and abashed"; "problems that call for bold not timid responses"; "a very unsure young man"
  3. Lacking conviction or boldness or courage (synset 300266855)
    "faint heart ne'er won fair lady"
Noun
  1. People who are fearful and cautious (synset 107961176)
    "whitewater rafting is not for the timid"

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