Unclassifiably is valid Scrabble Word

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

Definitions for UNCLASSIFIABLY in dictionary:

Similar words containing CLASSIFIAB without suffix ly and without prefix un

classifiable19 declassifiable22 unclassifiable21
Find what other words can be done using letters: "unclassifiably"
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