Select the word that is the exact opposite of the word MELLIFLUOUS in meaning from the given options:-

The correct option is Cacophonous.

To understand why this is the correct choice, let us break down the meanings of the words:
1. Mellifluous: This word originates from Latin roots meaning "flowing with honey" (mel meaning honey, and fluere meaning to flow). It is used to describe a sound, voice, or music that is sweet, smooth, pleasant, and musical to hear.
2. Cacophonous: This word comes from the Greek roots kakos (meaning bad or harsh) and phone (meaning voice or sound). It describes a harsh, discordant, mixture of sounds that is highly unpleasant to the ears.
Since "mellifluous" represents a sweet and pleasing sound, and "cacophonous" represents a harsh and discordant sound, they are direct opposites in meaning.

Let us also look at the other options to see why they do not fit:
- Resonant: Means deep, clear, and continuing to sound or ring; this is closer to being a synonym or positive attribute rather than an opposite.
- Harmonious: Means tuneful, sweet-sounding, or pleasingly free from disagreement; this is a synonym for mellifluous.
- Acrimonious: While it means angry and bitter in nature or tone, it typically describes relationships, discussions, or feelings rather than physical sounds.