You might be confusing the word infamous with unfamous. These words are commonly misused.

Word parts change

in- + famous or infamy + -ous

Pronunciation change

Adjective change

Positive
infamous

Comparative
more infamous

Superlative
most infamous

  1. Someone or something that is infamous is well-known, but for bad reasons. They are famous, but are hated and considered to be bad.

Usage notes change

Infamous is the opposite of famous, but only in the sense that they express opposite opinions. For an opposite of famous that means someone/something that isn't very well-known, you should use words like obscure, overlooked, little-known, etc.