Injudicious

RASH

Acting without thinking might leave you with this four-letter consequence.

"Injudicious" means acting without careful thought, and "rash" is a perfect synonym—it describes reckless or hasty behavior. The clue plays it straight here, with no hidden wordplay or tricks; it’s a direct definition where both words share the same meaning. If you think of someone making a snap decision they later regret, "rash" fits just as well as "injudicious." Simple and to the point!