Synonyms of at ease in English:

at ease

(also at one's ease)

See US English definition of at ease

See UK English definition of at ease

phrase

1‘when he woke he felt wonderfully at ease’

SYNONYMS
relaxed, calm, serene, tranquil, unworried, contented, content, happy
comfortable, secure, safe
informal chilled
ANTONYMS

tense, uncomfortable