timorous
Meaning: timid, fearful
Usage: When dealing with the unknown, timorous Tallulah almost always broke into tears.
tremulous
Meaning: fearful
Usage: I always feel a trifle tremulous when walking through a graveyard.
bashful
Meaning: shy, excessively timid
Usage: Frankie’s mother told him not to be bashful when he refused to attend the birthday party.
daunting
Meaning: intimidating, causing one to lose courage
Usage: He kept delaying the daunting act of asking for a promotion.