Unrightfulness is valid Scrabble Word

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

Definitions for UNRIGHTFULNESS in dictionary:

Similar words containing RIGHTFULNES without suffix s and without prefix un

rightfulness19 frightfulness23 rightfulnesses21 sprightfulness23 frightfulnesses25 sprightfulnesse24 sprightfulnesses25
Find what other words can be done using letters: "unrightfulness"
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