Unbusiest is valid Scrabble Word

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

Definitions for UNBUSIEST in dictionary:

Words related to UNBUSIEST

unbusy11
Find what other words can be done using letters: "unbusiest"
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