Scrabble Dictionary

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Yes, undue is playable

...and is worth 9 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Undue" Definition

adjective

Exceeding what is appropriate or normal; excessive: "I was grateful, without showing undue excitement” ( Katherine Mansfield).
Not just, proper, or legal: undue use of force.
Not yet payable or due: an undue loan.
Exceeding or violating propriety or fitness .
Not due not yet payable.