Usually means: Behaving in a foolish manner.
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We found 3 dictionaries that define the word ninnyish:

General (3 matching dictionaries)
  1. ninnyish: Collins English Dictionary
  2. ninnyish: Wiktionary
  3. ninnyish: Dictionary.com

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Definitions from Wiktionary (ninnyish)

▸ adjective:  silly; foolish

Similar:
ninny-pinny, nincompoopish, nice, silly, numptyish, sillyish, desipient, slight, airheaded, derpy, more...

Opposite:
smart, intelligent, clever, astute, shrewd

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Similar:
ninny-pinny, nincompoopish, nice, silly, numptyish, sillyish, desipient, slight, airheaded, derpy, more...

Opposite:
smart, intelligent, clever, astute, shrewd



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