Apprehensive
Else clues• Bashful
• Cautious
• Cautious and fearful
• Chicken
• Chicken-livered
• Clark Kent-like
• Clark Kentish
• Demure
• Diffident
• Easily alarmed
• Easily frightened
• Easily scared
• Edgy
• Fainthearted
• Far from aggressive
• Far from assertive
• Far from forward
• Hardly courageous
• Hardly heroic
• Hardly outgoing
• In 1501, it was fearful
• Indecisive
• Intrepid's antithesis
• Lacking backbone
• Lacking confidence
• Lacking in courage
• Like a deer
• Like a little rabbit
• Like a milquetoast
• Like a mouse
• Like a nebbish
• Like a shrinking violet
• Like a wallflower
• Like Caspar Milquetoast
• Like Clark Kent
• Like Milquetoast
• Like Mr. Milquetoast
• Like Piglet
• Like Tolkien's Bilbo Baggins
• Like wallflowers
• Lily-livered
• Meek
• Mousy
• Not assertive
• Not at all alpha
• Not at all brave
• Not bold
• Not exactly outgoing
• Not made of brass
• Pusillanimous
• Reticent to say, upon reflection, D-! I'm it!
• Retiring
• Said of a fraidy cat
• Sheepish
• Shrinking
• Shy
• Skittish
• Unassertive
• Unlike the life of the party
• Unlikely to mix
• Yellowish
• People who are fearful and cautious