1. impossible to explain or understand; mysterious

Examples

• The sudden disappearance of the documents was unexplainable.
• She felt an unexplainable sense of dread when entering the old house.
• The team’s poor performance this season remains unexplainable to fans.
• There was an unexplainable connection between the two strangers.
• The machine’s malfunction was completely unexplainable to the technicians.
• His unexplainable behavior worried his family and friends.