Vocabulary antonyms — Pick the best opposite of ‘‘QUIESCENT’’ (advanced vocabulary; precise antonym recognition).

Given data

• Target word: QUIESCENT
• Options: ACTIVE; Dormant; Weak; Unconcerned

Concept/Approach
'Quiescent' = at rest; inactive; causing no symptoms. The crisp antonym is 'Active'.

Why others are not antonyms
Dormant: near-synonym (inactive).Weak: low strength, not opposite of inactivity.Unconcerned: about attitude, not activity level.

Example
A quiescent volcano ↔ an active volcano.

Final Answer
ACTIVE