Concerningly is valid Scrabble Word

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

Definitions for CONCERNINGLY in dictionary:

Similar words containing NCERNING without suffix ly and without prefix co

concerning15 unconcerning17 overconcerning22
Find what other words can be done using letters: "concerningly"
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