inactive
lazy
passive
phlegmatic
the antonym of active is passive
Synonym is tired antonym is active
An antonym for the word latent would be active.
advanced, active
active
Action
synonym - inactive antonym - active
I think the antonym is active
No. An antonym of quiescent would be active. You must be thinking of "latent", which would be almost a synonym of quiescent, meaning "undeveloped, hidden."
The opposite or antonym of inactive is active. Some synonyms for active (and thus, antonyms for inactive) are lively, live, brisk, energetic, and operative.
Lively, active, energetic, happy!
An antonym to diurnal is nocturnal when diurnal is defined; of or belonging to or active during the day; "diurnal animals are active during the day"; "diurnal flowers are open during the day and closed at night" Another antonym to diurnal is aperiodic (vs. periodic) when diurnal is defined; having a daily cycle or occurring every day; "diurnal rotation of the heavens" ~gpack