1. not kind, pleasant, or welcoming in manner or behavior
2. not helpful or favorable; creating difficulties or problems

Examples

• The store clerk was unfriendly and barely looked at us.
• She gave him an unfriendly stare when he interrupted her.
• The weather conditions were unfriendly for outdoor activities.
• His unfriendly attitude made it difficult to work with him.
• The new policy created an unfriendly environment for small businesses.
• The dog seemed unfriendly, so we kept our distance.
• The unfriendly terrain made hiking extremely challenging.