Unattempted is valid Scrabble Word

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

11 letters word
16 points in Scrabble
20 points in WWF

Definitions for UNATTEMPTED in dictionary:

ADJECTIVE:

not attempted
not previously attempted or embarked upon; untried

How to use UNATTEMPTED in a sentence

I very readily allow, my lords, that nothing has been left unattempted that might fill the people with suspicion and discontent.
The managers and overseers, commonly unmarried, left no female virtue unattempted.
It was then time to exert their utmost efforts to stop our progress, and nothing was to be left unattempted that interest could suggest.
Why not? She has a new and unattempted problem to solve, perchance that of the happiest nature that ever bloomed.
But the death of Stafford was too important a stroke of party to be left unattempted by any expedient, however extraordinary.
That with no middle flight intends to soar Above the Aonian mount, while it pursues Things unattempted yet in prose or rhyme.
The work attempted and done is great, the work unattempted and not done is far greater.

Similar words containing ATTEMPT without suffix ed and without prefix un

attempt11 attempts12 attempted14 attempter13 reattempt13 attempters14 attempting15 reattempts14 attemptable17 reattempted16 reattempting17 attemptability23

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