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Adjective
Example: “It was an arduous journey.”
Synonyms: difficult, demanding
Antonyms: easy
Verb
Example: “He went to the countryside to recuperate.”
Synonyms: recover, heal
Antonyms: decline, worsen
Example: “Long meetings tire me quickly.”
Synonyms: exhaust, wheel cover
Antonyms: refresh
Example: “She has an inexhaustible curiosity about people.”
Synonyms: boundless
Antonyms: limited
Adverb
Example: “The company aims to grow sustainably over the next decade.”
Synonyms: responsibly
Antonyms: recklessly
Example: “We need a sustainable model, not short-term fixes.”
Synonyms: viable
Antonyms: unsustainable
Example: “I am tired today.”
Synonyms: sleepy, exhausted
Antonyms: energetic
Example: “The company grew unsustainably fast.”
Synonyms: unviably
Antonyms: sustainably
Example: “The current system is unsustainable.”
Synonyms: unviable
Antonyms: sustainable
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