Unthriftiest is valid Scrabble Word

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

Definitions for UNTHRIFTIEST in dictionary:

Words related to UNTHRIFTIEST

unthrifty18
Find what other words can be done using letters: "unthriftiest"
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