The two crossword solutions for the term 'ISN'T THAT OBVIOUS!?' are 'DUH' (3 letters) and 'YATHINK' (7 letters). Both of these terms are slang expressions used to indicate THAT something is OBVIOUS or should be self-evident. 'Duh' is a shortened version of 'duh-uh, ' which is an interjection used to express disbelief or surprise. 'Yathink' is a combination of 'YOU' and 'THINK, ' and is used to sarcastically suggest THAT someone should have known something.