| macabre | macabro, lúgubre = ghastly, grim |
| mace | gás lacrimogêneo |
| maelstrom | turbilhão |
| makeshift | provisório, temporário, paliativo |
| malice / malicious | malícia / malicioso; mal-intencionado |
| mange / mangy | sarna (doença de pele) / 1) sarnento (com o pelo caindo) / 2) esfarrapado, sujo, esquálido |
| mangrove | mangue = a tropical tree that has roots which grow from its branches and that grows in swamps or shallow salt water |
| manhunt | perseguição, caçada |
| manor | mansão, solar = an estate owned by a king or nobleman |
| mantle | manto, capote = a cloak without sleeves |
| marque | marca, modelo = a product model or type, as of a luxury or racing car |
| massacre [messikâr] | massacre, carnificina = slaughter |
| maudlin | sentimental, piegas = overly emotional; "he became maudlin and started crying like a child" |
| mayhem | 1) caos, violência = actions that hurt people and destroy things; a scene or situation that involves a lot of violence / 2) mutilação = the crime of deliberately injuring another so as to cripple or mutilate |
| meander (to) | 1) serpentear "the stream meandered through the valley" / 2) vaguear, vagar = to wander aimlessly. |
| medic | 1) estudante de medicina = a medical student / 2) membro de corpo médico militar = a military medical corpsman. |
| merchantman | navio mercante = trading ship; merchant ship; merchant vessel |
| mesmerize (to), mesmerise (to) | cativar, fascinar |
| metier; métier | ofício, profissão |
| mettle | temperamento, disposição, índole |
| mind-boggling | complicado, intrincado |
| mineshaft | poço de mina |
| miser [maizar] | avarento, sovina, mesquinho, pão-duro = stingy, mean |
| mitre, miter | mitra = the official headdress of a bishop |
| moat | fosso = defensive ditch around a castle or fortress, usually containing water |
| mogul | magnata, manda-chuva = tycoon |
| monger (to) | vender = to sell |
| morish; moreish (adj - UK) | delicioso, gostoso |
| moot (to) / moot (adj) | levantar para discussão = to propose for discussion // discutível = debatable; moot point = ponto discutível |
| moped | ciclomotor, lambreta, moto pequena = a motorized bicycle with pedals, designed for low-speed operation. |
| moron / moronic | idiota, retardado / idiota |
| morph (to) | metamorfosear, transformar |
| mortician | agente funerário = undertaker |
| motley | variado, heterogêneo |
| mottled | manchado, malhado, sarapintado = marked with blotches of different colors |
| muddle (n) / muddle (to) | confusão, bagunça, trapalhada = a confused or disordered state of affairs / confundir, misturar = to mix up in a confused manner: |
| muffle (to) | abafar (som) = to wrap with something to deaden sound; "to muffle drums" |
| mumble (to) | resmungar, murmurar = to mutter; to grumble |
| mundane | mundano, banal |
| murk / murky | escuridão, trevas = darkness, gloom / escuro, obscuro, nublado, sombrio; "murky water"; "murky details of the case" |
| muse (to) | meditar, matutar = to think about or ponder quietly |
| mushy | 1) mole, pastoso; "the pasta was overcooked and mushy" / 2) sentimental, piegas; "mushy love stories" |
| musk | almíscar = strong-smelling substance obtained from a certain deer and used to make perfumes. |
| muster (to) | 1) reunir para inspeção = to assemble (troops, etc.), as for battle or inspection / 2) mostrar, exibir; "he mustered his courage" |
| musty | mofado, bolorento = moldy |
