timid in WordNet English dictionary

1. people who are fearful and cautious
   "whitewater rafting is not for the timid"
   timid  cautious 
   

1. lacking self-confidence
   "stood in the doorway diffident and abashed"; "problems that call for bold not timid responses"; "a very unsure young man"
   diffident  shy  timid  unsure 
   
2. lacking conviction or boldness or courage
   "faint heart ne'er won fair lady"
   faint  fainthearted  timid  faint-hearted 
   
3. showing fear and lack of confidence
   timid