Definition from Wiktionary, the free dictionary
- Containing nuts.
This is a nutty chocolate bar.
- Reminiscent of nuts.
- Barmy, crazy, mad.
Your wife is as nutty as a fruitcake.
In sense “insane”, similar to nuts, but more limited and somewhat milder: nutty means “eccentric, insane”, while “nuts” can mean either “insane” or “enthused, agitated” (“the crowd went nuts”), for which “nutty” is not used: *“the crowd went nutty”.
reminiscent of nuts