adjective

stealthy

stealthy, furtive, surreptitious

The cat made a stealthy approach to the bird.

The cat made a stealthy approach to the bird.

He took a stealthy look at his watch.

He took a stealthy look at his watch.

((a stealthy + noun)) describing a noun as being secretive or quiet. The spy made a stealthy entrance.

Synonyms: furtive, surreptitious; Antonyms: open, obvious

From Middle English 'stelthe' (theft), related to 'steal'. The '-y' suffix makes it an adjective.

Think of a 'stealth' bomber plane, which is designed to be unseen. 'Stealthy' is the adjective form.

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