Unsystematical is valid Scrabble Word

Is unsystematical a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words YES
Is unsystematical valid Words with Friends?
Words with Friends NO

Definitions for UNSYSTEMATICAL in dictionary:

How to use UNSYSTEMATICAL in a sentence

Find what other words can be done using letters: "unsystematical"
https://scrabble-word.com/finder/unsystematical
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