Griefful is valid Scrabble Word

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

Definitions for GRIEFFUL in dictionary:

Similar words containing GRIEF without suffix ful

grief9 griefs10 griefer11 griefers12 griefless13
Find what other words can be done using letters: "griefful"
https://scrabble-word.com/finder/griefful
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