Like an unconvincing argument, say Crossword Clue

 The answer to the crossword clue "Like an unconvincing argument, say" is WEAK. It has 4 letters.

The word "weak" can mean lacking in strength or power. It can also mean not convincing or persuasive. In the context of a crossword puzzle, the clue "like an unconvincing argument, say" is likely referring to the latter meaning.

Here are some other possible answers to the crossword clue "like an unconvincing argument, say":

LAME

THIN

UNSOUND

UNPERSUASIVE

UNSUBSTANTIATED

The best answer will depend on the specific context of the crossword puzzle.

I hope this helps! Let me know if you have other questions or requests.