Uncostliest is valid Scrabble Word

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

Definitions for UNCOSTLIEST in dictionary:

Words related to UNCOSTLIEST

uncostly13
Find what other words can be done using letters: "uncostliest"
https://scrabble-word.com/finder/uncostliest
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