Sorry, the term unallowable is not in the dictionary. Check the spelling and try removing suffixes like "-ing" and "-s".
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Nearby terms:
UMDL ♦ UML ♦ uML ♦ UMTS ♦ unary ♦ unary operator ♦ UNC ♦ UNCL ♦ UNCOL ♦ uncompression
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