How to Say "to mutter" in Spanish
The Spanish word for “to mutter” is “murmurar” — A2 level. This is a very common word in everyday Spanish.

Examples
Ella murmuró algo en mi oído.
She whispered something in my ear.
No murmures, habla más fuerte para que todos te oigan.
Don't mutter; speak louder so everyone can hear you.
El niño murmuraba una canción mientras jugaba.
The boy was humming a song under his breath while he played.
Using 'murmurar' for soft sounds
Unlike English 'mumble,' which usually implies you're doing something wrong, 'murmurar' can just mean speaking very quietly or sweetly.
Choosing between murmurar and susurrar
Mistake: “Using 'murmurar' when you specifically mean a romantic or secret whisper.”
Correction: Use 'susurrar' for intentional, soft whispers; use 'murmurar' more for talking under your breath or complaining quietly.
Related Translations
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