noun
a person who gives opinions on subjects they know nothing about
-
The professor was annoyed by the ultracrepidarian student who constantly interrupted the lecture with incorrect information.
-
Don't be an ultracrepidarian and act like you know everything about a topic you've never studied.
-
That guy is such an ultracrepidarian, always talking nonsense like he's an expert.
-
She was an ultracrepidarian in matters of the heart, giving unsolicited advice despite her own failed relationships.