The cat stealthily crept up on the unsuspecting mouse.
Meaning: This sentence describes a cat that is moving very quietly and cautiously in order to sneak up on a mouse that is not aware of its presence.
Choice of Words: Stealthily means to move or act in a secret or sneaky manner. Crept means to move slowly and quietly, often in a stealthy or cautious manner. Unsuspecting means not expecting or anticipating something.
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Related Expressions