Dictionary.com
Thesaurus.com

up to no good

Idioms  
  1. see up to, def. 3.


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Mr Rosenberg said the attacker, named by police as Jihad Al-Shamie, 35, appeared to be "up to no good" so was asked to leave.

From BBC • Oct. 6, 2025

Thanks to the late Ian Holm’s face being digitally superimposed over that of Daniel Betts, we’re primed to recognize that Rook is up to no good.

From Salon • Aug. 26, 2024

The Georgia legislature recognized that people who are up to no good can abuse our citizens’ security and the public order just as gravely while wearing a business suit.

From Slate • Aug. 15, 2023

“But to them it’s suspicious that you’re up to no good or you’re doing something that you shouldn’t be doing.”

From Los Angeles Times • Jul. 5, 2023

Some people think they're up to no good, that they're wasting their time.

From "Pride" by Ibi Zoboi