Synonyms:
* Drowned out: This suggests a sound being completely overwhelmed by another sound.
* Dampened: This implies a reduction in the intensity or clarity of a sound.
* Smothered: This suggests a sound being completely obscured, almost as if it's being suffocated.
* Subdued: This emphasizes a reduction in the volume or intensity of a sound.
* Soft: This suggests a gentle, quiet sound.
Antonyms:
* Clear: This implies a sound that is easily heard and understood.
* Loud: This refers to a sound with a high volume or intensity.
* Distinct: This describes a sound that is easily recognizable and separate from other sounds.
* Amplified: This suggests that a sound has been made louder.
* Unhindered: This implies that there is nothing obstructing or reducing the sound.
The best synonym or antonym for "muffled" will depend on the specific context in which you are using the word.