Unperforming is valid Scrabble Word

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

Definitions for UNPERFORMING in dictionary:

Similar words containing PERFORM without suffix ing and without prefix un

perform14 performs15 performed17 performer16 outperform17 performers17 performing18 outperforms18 performable20 performance20 performings19 unperformed19 nonperformer19 outperformed20 performances21 performative22 performatory22 underperform20 nonperformers20 nonperforming21 outperforming21 performatives23 underperforms21 unperformable22 nonperformance23 performability26 performatively27 preperformance25 underperformed23 underperformer22 nonperformances24 underperforming24 preperformances26 underperformers23 performabilitie24 performabilities25
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