Not up to much Crossword Clue

 The answer to the crossword clue "Not up to much" with 4 letters is IDLE.

This word means not active or busy. It can also mean lazy or unproductive. In the context of a crossword clue, it would likely refer to someone who is not very productive or active.

Here are some other words that could be used to describe someone who is not up to much:

Lazy - Not willing to work or exert oneself.

Unproductive - Not producing much or anything.

Inert - Having no energy or activity.

Languid - Lacking energy or vitality.

Drowsy - Sleepy or half asleep.

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