Unfriendly (adjective)

1. Not friendly in manner or behavior.
2. Not conducive to friendliness or goodwill.

Origin:

Late 17th century: from un- (expressing negation) + friendly.

Examples:

1. The unfriendly service left a bad taste in her mouth.
2. The unfriendly atmosphere made him feel uncomfortable.
3. The unfriendly terrain made the journey difficult.
4. The unfriendly host made her feel unwelcome.
5. The unfriendly receptionist gave her a cold welcome.