Choose the antonym of 'Lax'.

Correct option is A

The correct antonym of the given word is (a) Reliable.
Given word — Lax: Lax means not sufficiently strict, severe, or careful; slack; negligent (Hindi: शिथिल/ढीला/लापरवाह). It describes a person’s attitude, discipline, or enforcement that is too relaxed.
Example: Lax safety checks can lead to accidents.
Correct answer word — Reliable: Reliable means consistently good in quality or performance; dependable; careful and trustworthy (Hindi: विश्वसनीय/भरोसेमंद). In contexts of duty/discipline, being reliable implies careful, thorough, and responsible conduct—the opposite tendency to being lax.
Example: Riya is a reliable team lead who never overlooks safety protocols.
Synonyms (of lax): slack, negligent, lenient, careless.
Antonyms (of lax): strict, stringent, rigorous, reliable (contextual opposite in duty/performance).
Meanings of the other options:
· (b) Stack — a pile or to arrange in a pile (Hindi: ढेर/ढेर लगाना).
· (c) Careless — not giving sufficient attention or thought; negligent (Hindi: लापरवाह). (Synonym, not antonym.)
· (d) Loose — not tight/firm; slack (Hindi: ढीला). (Synonym, not antonym.)