Choose the word that is opposite in meaning to the given word.
Vain

Correct option is D

The correct antonym of the given word is (d) Productive.
Vain: Producing no result; useless or excessively proud. (बेकार, व्यर्थ)
Example: All his efforts were in vain.
Productive: Yielding results or output, useful. (उत्पादक)
Example: The meeting was highly productive.
Synonyms of vain: futile, pointless, hollow.
Antonyms: productive, fruitful, effective.
Other options:
· (a) Unpredictable – Not foreseeable (अप्रत्याशित)
· (b) Calculable – Measurable (गणनीय)
· (c) Harmony – Peace or agreement (सामंजस्य)