it is kind/stupid/careless etc of somebody (to do something)
From Longman Dictionary of Contemporary Englishit is kind/stupid/careless etc of somebody (to do something)it is kind/stupid/careless etc of somebody (to do something)CHARACTER/PERSONALITYused to say that someone’s action shows a particular quality It was kind of you to remember my birthday. → ofExamples from the Corpusit is kind/stupid/careless etc of somebody (to do something)• But, it, it is kind of funny.• So it is kind of coming home and a change of focus.• The idea of it is kind of cute: This little Frank guy is trying to find candy.