Undeterminably is valid Scrabble Word

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

Similar words containing DETERMINAB without suffix ly and without prefix un

determinable17 determinably20 indeterminable19 indeterminably22 undeterminable19 determinability23 predeterminable22 determinablenes20 determinableness21 determinablenesses23
Find what other words can be done using letters: "undeterminably"
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