The word opposite in meaning to the above word is:
Transient

Correct option is A

Correct antonym: (a) Perpetual
Meaning of the given word (Transient):
• Transient → lasting for a short time; temporary; passing quickly (Hindi: क्षणिक / अस्थायी)
• Key idea: short-lived.
Example: Joy is often transient.
Meaning of the correct option (Perpetual):
• Perpetual → continuing forever; never-ending; constant (Hindi: शाश्वत / निरंतर / हमेशा रहने वाला)
Example: The region suffers from perpetual drought.
Synonyms (Transient): temporary, brief, momentary, short-lived.
Antonyms (Transient): perpetual, permanent, lasting, enduring.
Meanings of other options (in detail):
• (b) Stiff → rigid; not flexible (Hindi: कठोर / अकड़ा हुआ)
• (c) Meaningless → without meaning; pointless (Hindi: अर्थहीन)
• (d) Noble → having high moral qualities; aristocratic (Hindi: महान / कुलीन)
Hence, option (a) is the correct answer.