
[Middle English, from Old French pernicios, from Latin perniciōsus, from perniciēs, destruction : per-, per- + nex, nec-, violent death.]
perniciously per·ni'cious·ly adv.
adjective
Definition: bad, hurtful
Antonyms: beneficial, favorable, helpful, innocuous, kind, loveable, loving
Three things too much, and three too little are pernicious to man; to speak much, and know little; to spend much, and have little; to presume much, and be worth little.
— Miguel de Cervantes (1547-1616)
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Tending to a fatal issue.

Dansk (Danish)
adj. - skadelig, fordærvelig
idioms:
Nederlands (Dutch)
verderfelijk, schadelijk, fataal
Français (French)
adj. - pernicieux
idioms:
Deutsch (German)
adj. - schädlich, bösartig
idioms:
Ελληνική (Greek)
adj. - επιβλαβέστατος, καταστρεπτικότατος, ολέθριος, (για νόσο κ.λπ.) κακοήθης
idioms:
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Português (Portuguese)
adj. - pernicioso, mortal, maligno
idioms:
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Español (Spanish)
adj. - pernicioso, nocivo, dañoso
idioms:
Svenska (Swedish)
adj. - ödeläggande, dödsbringande, elakartad, dödlig
中文(简体)(Chinese (Simplified))
有害的, 致命的, 有毒的
idioms:
中文(繁體)(Chinese (Traditional))
adj. - 有害的, 致命的, 有毒的
idioms:
한국어 (Korean)
adj. - 유해한, 치명적인, 간악한
日本語 (Japanese)
adj. - 有害な, 破壊的な, 致命的な
idioms:
العربيه (Arabic)
(صفه) مؤذ, مفسد, سيئ, هدام
עברית (Hebrew)
adj. - מזיק, משחית, ממאיר, קטלני, רציני
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