I can demand attention without a sound, I exist in thoughts but cannot be grasped. What am I?

Category: Mystery · Difficulty: hard

Hint: Consider something that can linger in one's mind.

Answer

A nagging doubt

Explanation

A nagging doubt persists quietly in one's thoughts, often influencing decisions.

This is a hard mystery riddle — a tricky one that takes a little thought. The answer is A nagging doubt.

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