1. impossible or extremely difficult to guess or predict

Examples

• The password was completely unguessable with its random combination of letters and numbers.
• Her reaction to the news was unguessable.
• The magician’s next trick seemed unguessable to the amazed audience.
• The quiz contained several unguessable questions about obscure historical facts.
• His unguessable behavior kept everyone wondering what he would do next.
• The computer generated an unguessable security code.