Select the word or phrase which best expresses the meaning of the given word: TIMID

The word 'timid' describes a person who lacks courage or confidence and is easily frightened. 'Shy' is the closest synonym as it describes a person who is nervous or timid in the company of other people.

Step-by-step Derivation:
Step 1: Analyze the definition of the target word 'Timid'. Timid means showing a lack of courage or confidence; easily frightened.
Step 2: Evaluate Option A ('Fast'). Fast refers to speed of motion, which is unrelated to courage or confidence.
Step 3: Evaluate Option B ('Slow'). Slow refers to a low speed of motion or progress, which is unrelated to courage or confidence.
Step 4: Evaluate Option C ('Medium'). Medium refers to an intermediate size or degree, which is unrelated to courage or confidence.
Step 5: Evaluate Option D ('Shy'). Shy means being nervous or timid in the company of other people. This aligns directly with the definition of 'timid'.
Step 6: Conclusion: Option D is the only synonym among the choices.