- The definition of pesky is someone or something that is annoying and causes trouble.
A little sister that annoys you and follows you everywhere is an example of a pesky little sister.
pesky definition by Webster's New World
pesky definition by American Heritage Dictionary
adjective pes·ki·er, pes·ki·est Informal
Troublesome; annoying: a pesky mosquito.
Origin: Probably alteration of pest.
- pesˈki·ly adverb
- pesˈki·ness noun