The most fitting antonym for "earth" in the sentence "Man has been on the earth for centuries" is sky or space, as it represents a different celestial body or location in contrast to our planet. Other synonyms for earth include the world, globe, and planet, while antonyms for "human" could include nonhuman or inhuman, but in this sentence, "earth" refers to the planet, not the species.
Antonym: Man has been on the "earth" for centuries.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the SIBA Testing Service (STS) preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.