Step 1: Understand the meaning of 'timid'. 'Timid' describes someone who is easily frightened, lacks confidence, or is reluctant to act boldly. Step 2: Find the synonym. A synonym has the SAME or very similar meaning. 'Shy' = reluctant to interact, lacking boldness — this closely matches 'timid'. Step 3: Confirm by eliminating the others. 'Brave' is an antonym; 'fierce' is an antonym in character; 'calm' is only partially related. Answer: shy