a person who is clueless and utterly idiotic. A person who makes mistakes alot.
Tiffany made another stupid Mistake. tiffany must be such a Ninny!
by PedroBoy October 25, 2010
Get a ninny mug for your coworker James.
Nickname of mine!
Shortened and easier way of saying Níniel
-WHAT!? what the hell do you prnounce Níniel? It has a funny í in it!

-Just say call me Ninny!
by What does pseudonym mean?? February 20, 2005
Get a ninny mug for your cousin Yasemin.
The most beautifullest person that has ever been alive. Also an amazing artist and a good friend for people who she loves.
Ninni is so talented
by Tadisti January 16, 2019
Get a Ninni mug for your mama Helena.
Female version of a Nincumpoop. Someone who is being silly, stupid or without reasonable thoughts.
Sarah you big ninnie, you just put your car keys in the ice box

Or

If Beth is a class clown you might say
Beth is a ninnie
by ddlD2 March 17, 2014
Get a ninnie mug for your daughter Helena.