calm, tranquil, serene, placid, peaceful mean quiet and free from disturbance. calm often implies a contrast with a foregoing or nearby state of agitation or violence. tranquil suggests a very deep quietude or composure. serene stresses an unclouded and lofty tranquility.

She smiled serenely and said nothing. "It is really very easy," he said serenely. The red, yellow, and blue balloon was seen by neighbors sailing serenely over the nearby fields. She sat there …

She smiled serenely and said nothing. "It is really quite easy," he said serenely. The red, yellow, and blue balloon was seen by neighbours sailing serenely over the nearby fields. She sat …

Doing something serenely means acting in a calm, peaceful way. Think of a vacationer relaxing in a beach chair, gazing serenely at the wide blue ocean and the expanse of soft sand.

There is one meaning in OED's entry for the adverb serenely. See ‘Meaning & use’ for definition, usage, and quotation evidence.

Definition of serenely adverb in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Synonyms for SERENELY: cooly, calmly, peacefully, placidly, coolly, imperturbably, unconcernedly, composedly; Antonyms of SERENELY: wildly, frantically, madly, frenetically, frenziedly, hectically, amok, amuck

Content or composed; untroubled: "She remained serene in the face of her accusers" (Peter Matthiesen). 2. Unaffected by disturbance; calm or peaceful: a serene forest. See Synonyms at calm. 3. Unclouded; fair: serene skies and a bright blue sea.