Untrembling is valid Scrabble Word

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

Definitions for UNTREMBLING in dictionary:

Words related to UNTREMBLING

untremblingly21

How to use UNTREMBLING in a sentence

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