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"unfriendly" is also used as a crossword clue. If that's what you saw, the answer is often hostile (7 letters).
Definitions
not disposed to friendship or friendliness
Word origin
From Middle English unfrendli, from Old English unfrēondlīċe (“in an unfriendly manner”), equivalent to unfriend + -ly.
Used in a sentence
“Shrekkies will notice that the musical is going off-piste from the film right from the start when the curtain rises to reveal a seven-year-old Shrek turfed out into an unfriendly world by his parents.”
“I thought of him as a young man in Washington for the first time, first job with McCarthy, and that that was probably one of the unfriendliest spaces at the time for a gay person.”
“Sweep the valley compound and eliminate any unfriendlies you encounter.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Hostile”10 letters
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