Select the most appropriate synonym of the given word.
Obstinate

Correct option is B

The correct synonym of the given word is (b) stubborn — Stubborn.
Obstinate means someone who is unreasonably determined not to change their opinion or behaviour, even when it is sensible to do so. Such a person refuses advice and remains rigid. (Hindi meaning: हठी / ज़िद्दी)
Example: He is obstinate and never accepts his mistake.
Stubborn means unwilling to change one’s attitude or position, showing firm rigidity similar to obstinate. It carries the same idea of being adamant and not listening to others. (Hindi meaning: ज़िद्दी / हठी)
Example: She is stubborn about doing everything her own way.
Synonyms: adamant, inflexible, headstrong, rigid.
Antonyms: flexible, compliant, agreeable, submissive.
Meanings of all the other given options:
· (a) obsolete: no longer in use; outdated (पुराना/अप्रचलित)
· (c) ordinary: common; not special (सामान्य)
· (d) old: aged; not new (पुराना/वृद्ध)