imperturbable

adj.
Unshakably calm and collected. See synonyms at cool.

imperturbability im'per·turb'a·bil'i·ty or im'per·turb'a·ble·ness n.
imperturbably im'per·turb'a·bly adv.

adjective

Not easily excited, even under pressure: calm, collected, composed, cool, cool-headed, detached, even¹, even-tempered, nonchalant, possessed, unflappable, unruffled. See calm/agitation.

adj

Definition: calm, collected
Antonyms: edgy, excitable, irritable, jittery, perturbable, touchy

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IN BRIEF: Calm.

The teacher was imperturbable no matter how rowdy her students were.

Dansk (Danish)
adj. - rolig, uanfægtet, uforstyrrelig

Nederlands (Dutch)
onverstoorbaar

Français (French)
adj. - imperturbable

Deutsch (German)
adj. - ruhig, unerschütterlich

Ελληνική (Greek)
adj. - ατάραχος, αθορύβητος, απαθής, φλεγματικός

Italiano (Italian)
imperturbabile

Português (Portuguese)
adj. - imperturbável

Русский (Russian)
невозмутимый

Español (Spanish)
adj. - imperturbable

Svenska (Swedish)
adj. - orubblig(t lugn)

中文（简体）(Chinese (Simplified))
沉着的, 镇静的, 泰然自若的

中文（繁體）(Chinese (Traditional))
adj. - 沈著的, 鎮靜的, 泰然自若的

한국어 (Korean)
adj. - 침착한, 태연한

日本語 (Japanese)
adj. - 落ちついた, 動じない

العربيه (Arabic)
‏(صفه) هادئ, رابط الجأش‏

עברית (Hebrew)
adj. - ‮שקט, קר-רוח, רגוע‬

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