harmful

English

From Middle English harmful, from Old English *hearmful (suggested by hearmfullīċ (“harmful; hurtful”)), equivalent to harm +‎ -ful.

Cognate with German harmvoll, Danish harmfuld, Swedish harmfull.

harmful (comparative harmfuller or more harmful, superlative harmfullest or most harmful)

of a kind likely to be damaging; injurious
Wear a hat to protect your skin from harmful sunlight.

Nouns to which "harmful" is often applied: effect, consequence, impact, influence, emission, chemical, ingredient, substance, gas, agent, additive, drug, radiation, dust, organism, plant, animal, insect, action, act, behavior, component, content, activity, interference, use.

likely to be damaging

Arabic: مضر‎
Armenian: վնասակար (hy) (vnasakar), վնասաբեր (hy) (vnasaber)
Azerbaijani: zərərli, ziyankar
Belarusian: шко́дны m (škódny), шкоднасны m (škódnasny)
Bengali: ক্ষতিকর (kkhtikôr), ক্ষতিকারক (kkhtikarôk)
Bulgarian: вреден (bg) (vreden), пакостен (bg) (pakosten)
Catalan: nociu (ca)
Chinese:
Mandarin: 有害 (zh) (yǒuhài), 不良 (zh) (bùliáng)
Czech: škodlivý (cs) m
Danish: skadelig (da)
Dutch: schadelijk (nl)
Finnish: vahingollinen (fi), haitallinen (fi)
French: dangereux (fr), nuisible (fr), nocif (fr), préjudiciable (fr)
Galician: perxudicial m or f
Georgian: საზიანო (saziano), მავნე (mavne)
German: schädlich (de)
Hindi: please add this translation if you can
Hungarian: káros (hu), kártékony (hu)
Icelandic: skaðlegur (is)
Indonesian: berbahaya (id)
Irish: aimhleasach, biniúil, damáisteach, díobhálach, dochrach, éigineáil, mímhaitheasach, olc, olcach, urchóideach
Italian: dannoso (it), nocivo (it)
Japanese: 有害な (ja) (ゆうがいな, yūgai-na)

Javanese: mbebayani
Korean: 해로운 (haeroun), 유해한 (yuhaehan)
Latin: nocuus, noxius
Macedonian: штетен (šteten)
Malay: berbahaya
Maori: whakakino
Norman: niêsibl'ye m or f (Jersey)
Norwegian: skadelig (no)
Persian: please add this translation if you can
Polish: szkodliwy (pl)
Portuguese: prejudicial (pt), nocivo (pt), danoso (pt), daninho (pt)
Romanian: nociv (ro), prejudiciabil (ro), dăunător (ro), vătămător (ro), păgubitor (ro), stricător (ro)
Russian: вре́дный (ru) (vrédnyj), вредоно́сный (ru) m (vredonósnyj), зловре́дный (ru) m (zlovrédnyj)
Serbo-Croatian:
Cyrillic: шко̀дљив, шко̏дан, ште̏тан
Roman: škòdljiv (sh), škȍdan (sh), štȅtan (sh)
Slovene: škodljiv
Spanish: perjudicial (es), dañino (es), nocivo (es), dañoso (es)
Swedish: skadlig (sv)
Tagalog: mapaminsala, nakakapinsala, nakakasira, nakasasama
Telugu: హానికరమైన (te) (hānikaramaina)
Turkish: zararlı (tr)
Turkmen: zyýanly (tk)
Ukrainian: шкідли́вий (škidlývyj)
Urdu: مضر‎