Undistempered is valid Scrabble Word

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

Definitions for UNDISTEMPERED in dictionary:

Similar words containing DISTEMPER without suffix ed and without prefix un

distemper14 distempers15 distempered17 distemperate17 distempering18 distemperature19 distemperatures20
Find what other words can be done using letters: "undistempered"
https://scrabble-word.com/finder/undistempered
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