Like a triangle with unequal side lengths (7)

I believe the answer is:

scalene

(Other definitions for scalene that I've seen before include "Unequal-sided (triangle)" , "(Of triangle) with each side of a different length" , "Describing a triangle with unequal sides" , "(Of triangle) having three unequal sides" , "Having no sides for a match" .)

I've seen this clue in the Universal.

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