Definition of pesky adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈpeski//
; NAmE NAmE//ˈpeski//
[only before noun] (informal, especially North American English)
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annoying pesky insects I can’t go out tonight—I’ve got that pesky interview tomorrow. those pesky kids Word Origin late 18th cent.: perhaps related to pest.
See the Oxford Advanced American Dictionary entry: pesky