imperturbable
[adjective]
Synonyms: calm, collected, composed, cool, nerveless, self-possessed, serene, unexcitable, unflappable (informal), unruffled

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Antonyms: choleric, touchy
Contrasted words: discomfited, disconcerted, fazed, rattled, irascible, splenetic, testy
Related Words: complacent, self-satisfied, smug, unaffected, unmoved, untouched

[TahlilGaran] English Synonym Dictionary ▲

im‧per‧tur‧ba‧ble /ˌɪmpəˈtɜːbəbəl $ -pərˈtɜːr-/ adjective
remaining calm and unworried in spite of problems or difficulties Synonym : unflappable
—imperturbably adverb
—imperturbability /ˌɪmpətɜːbəˈbɪləti, ˌɪmpətɜːbəˈbɪlɪti $ -pərtɜːr-/ noun [uncountable]

[TahlilGaran] Dictionary of Contemporary English ▲