Synonyms of serene in English:

serene


See US English definition of serene

See UK English definition of serene

See Spanish definition of sereno

adjective

1‘on the surface I might have seemed serene, but underneath I was panicking’

SYNONYMS
calm, composed, collected, cool, calm, and collected, as cool as a cucumber, tranquil, peaceful, at peace, pacific, untroubled, relaxed, at ease, poised, self-possessed, unperturbed, imperturbable, undisturbed, unruffled, unworried, unexcitable, placid, equable, even-tempered
North American centered
informal together, unflappable, chilled
North American informal nonplussed
ANTONYMS

anxious, nervous, agitated

2‘Trentino is a labyrinth of deep valleys and serene lakes’

SYNONYMS
peaceful, tranquil, quiet, still, restful, relaxing, soothing, undisturbed, untroubled
ANTONYMS

turbulent, noisy

3‘the serene western sky’

SYNONYMS
cloudless, unclouded, clear, bright, sunny
ANTONYMS

cloudy, stormy