Unconcerning is valid Scrabble Word

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

12 letters word
17 points in Scrabble
25 points in WWF

Definitions for UNCONCERNING in dictionary:

ADJECTIVE:

not concerning
Not interesting of affecting; insignificant; not belonging to one.

Similar words containing CONCERN without suffix ing and without prefix un

concern11 concerns12 concerned14 unconcern13 concerning15 nonconcern14 unconcerns14 concernancy20 concernedly19 concernment17 nonconcerns15 overconcern18 unconcerned16 concernments18 overconcerns19 concerningly20 concernancies19 concernedness18 overconcerned21 unconcernedly21 unconcernment19 overconcerning22 unconcernments20 concernednesses20 unconcernedness20 unconcernednesses22

Find what other words can be done using letters: "unconcerning"
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