Is this your crossword clue?
"unattractive" is also used as a crossword clue. If that's what you saw, the answer is often ugly (4 letters).
Definitions
lacking beauty or charm
Word origin
From un- + attractive.
Used in a sentence
“In light of the similarities of this word to siṡáya etc. and their close semantic proximity, it is unattractive to separate these two words.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Not appealing”12 letters
Not quite right?
"Search similar patterns."
U___________