Undrossiest is valid Scrabble Word

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

Definitions for UNDROSSIEST in dictionary:

Words related to UNDROSSIEST

undrossy12
Find what other words can be done using letters: "undrossiest"
https://scrabble-word.com/finder/undrossiest
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