Unchastised is valid Scrabble Word

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

Definitions for UNCHASTISED in dictionary:

How to use UNCHASTISED in a sentence

Similar words containing CHASTIS without suffix ed and without prefix un

chastise13 chastised15 chastiser14 chastises14 chastisers15 chastising16 chastisable18 chastisement19 chastisements20 unchastisable20
Find what other words can be done using letters: "unchastised"
https://scrabble-word.com/finder/unchastised
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