Topic: Antonyms, Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The word "sluggish" describes a state of movement that is slow, lethargic, or lacking in energy. In seeking an antonym, we look for a word that conveys the opposite qualities—specifically, a sense of liveliness and energy. Among the given options, "animated" stands out as the most fitting antonym.

"Animated" refers to being lively, spirited, or full of life and energy. In contrast to "sluggish," which implies a certain heaviness or lethargy, "animated" captures a vibrant and dynamic quality. While "dull," "heavy," and "slow" all suggest a lack of movement or energy, they do not convey the same sense of vivacity that "animated" does. For instance, "dull" denotes a lack of excitement, "heavy" implies weight, and "slow" directly mirrors the core concept of sluggishness.

Thus, "animated" is the best choice as it directly embodies the opposite of what "sluggish" represents, highlighting a state of being that is energetic and brisk. This distinction is key in understanding the relationship between the two words, making "animated" the correct answer.