Unsupportable is valid Scrabble Word

Is unsupportable a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is unsupportable valid Words with Friends?
Words with Friends YES

13 letters word
19 points in Scrabble
26 points in WWF

Definitions for UNSUPPORTABLE in dictionary:

ADJECTIVE:

How to use UNSUPPORTABLE in a sentence

The excessive heat of the dying summer had grown almost unsupportable in the tower chamber where Baron de Trenck was confined.
The silence became unsupportable for once to Indian taciturnity.
From time to time, I rent the universal silence with the roarings of unsupportable despair.
Only a narrow space separated this building from the blockhouse, and with the fierce blaze of its pine logs the stifling heat in the latter became almost unsupportable.

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