'Ninny' definitions:
Definition of 'ninny'
From: WordNet
noun
A stupid foolish person [syn: nincompoop, poop, ninny]
Definition of 'Ninny'
From: GCIDE
- Ninny \Nin"ny\, n.; pl. Ninnies. [Cf. It. ninno, ninna, a baby, Sp. ni[~n]o, ni[~n]a, child, infant, It. ninna, ninna nanna, lullably, prob. fr. ni, na, as used in singing a child to sleep.] A fool; a simpleton. --Shak. [1913 Webster]
Synonyms of 'ninny'
From: Moby Thesaurus