1. not likely to happen or be true; improbable
2. not suitable or promising for a particular purpose

Examples

• It’s unlikely to rain today given the clear skies.
• The team made an unlikely comeback in the final minutes.
• She seemed an unlikely candidate for the leadership position.
• It’s unlikely that he’ll arrive on time given the traffic.
• The unlikely friendship between the two rivals surprised everyone.
• An unlikely hero emerged from the small town.
• The story has an unlikely but happy ending.