Correct option is B
The correct antonym of the given word is Unsuccessful.
Triumphant means having achieved victory or success. (Hindi: विजयी)
Example: The team returned triumphant after winning the championship.
Unsuccessful refers to failing to accomplish a desired result or achieving no success. (Hindi: असफल)
Example: His attempt at starting a business was unsuccessful, but he didn't give up.
Synonyms: Victorious, Jubilant, Successful, Thriving
Antonyms: Failing, Defeated, Unsuccessful, Losing
Meanings of the given other options:
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Flourishing: Developing or thriving successfully (Hindi: फलता-फूलता)
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Unsuccessful: Failing to achieve success (Correct answer) (Hindi: असफल)
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Jubilant: Extremely joyful or triumphant (Hindi: उल्लासित)
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Tender: Showing gentleness or softness (Hindi: कोमल)