What does "dunno" mean?

An utterance of the word dunno.

What is a synonym for "dunno"?

Common synonyms include: be unaware, be uncertain, beats me, express ignorance, have no idea, no idea.

/ˈdʌnəʊ/ contraction, noun, slang

contraction, noun, slang ·Moderate ·College level

Noun

Contraction

1
Pronunciation spelling of do not know; pronunciation spelling of does not know. alt-of, contraction, informal, pronunciation-spelling
"I dunno the answers to any of those questions, and you dunno and he dunno either."

"I dunno if it's a bug or what, but this software doesn't work right."

Written form of an informal pronunciation of don't know that is a reduction of do not know or does not know.