Antonym of ONEROUS

The correct answer is: B. easy

An antonym is a word that means the opposite of another word. In this case, the word “onerous” means “burdensome” or “difficult.” The opposite of “onerous” is therefore something that is not burdensome or difficult, and that is “easy.”

The other options are not antonyms of “onerous.”

• Option A, “straightforward,” means “easy to understand or do.” This is not the opposite of “onerous,” as something can be both straightforward and burdensome.
• Option C, “complex,” means “having many parts or elements.” This is not
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  the opposite of “onerous,” as something can be both complex and burdensome.
• Option D, “plain,” means “not decorated or elaborate.” This is not the opposite of “onerous,” as something can be both plain and burdensome.