Firmly means in a way that's strong, steady, and determined, without wavering or giving in. When you grip a baseball bat firmly, you hold it tight and secure so it won't slip. When you speak firmly to someone, your voice is confident and resolute, showing you mean what you say.

The word captures both physical strength and mental resolve. A teacher might firmly remind students about classroom rules, using a voice that's serious but not angry. A gymnast plants her feet firmly on the balance beam, making sure she's stable before attempting a difficult move. When parents firmly refuse to let you skip homework to play video games, they're standing by their decision even if you complain.

Something held firmly stays in place. Something said firmly leaves no doubt about what you mean. When you believe something firmly, you're convinced it's true and won't easily change your mind. The word suggests strength without meanness: you can be firm and kind at the same time. A firm handshake, a firm foundation, and a firm decision all share that quality of being solid and dependable rather than weak or uncertain.