Undeclining is valid Scrabble Word

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

Definitions for UNDECLINING in dictionary:

Similar words containing DECLIN without suffix ing and without prefix un

decline10 declinal11 declined12 decliner11 declines11 declinals12 declinant12 declinate12 decliners12 declining13 declinist12 declinable15 declinants13 declinator13 declinists13 declination14 declinators14 declinatory17 declinature14 declinations15 declinatures15 declinometer17 indeclinable17 indeclinably20 codeclination18 declinational16 declinatories16 declinometers18 codeclinations19
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