LATIN DICTIONARYLexicon Latīnum
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“bad” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

bad
in a physical sense, malus: bad weather, tempestas mala, adversa, foeda: a bad journey, iter difficile, incommodum: a very bad road, via deterrima: bad money, numi adulterini: a bad throat, angina: bad eyes, oculi lippi: to have bad eyes, lippire: he who has bad eyes, lippus: a bad head, porrigo.
In a moral sense, malus (bad by nature: opposed to bonus): pravus (corrupted, by bad habit): bad by nature and corrupted by habit, malus pravusque: homo nequam (a bad or worthless fellow: opposed to frugi): to have a bad heart, esse ingenio malo pravoque: a bad conscience, conscientia mala: to be in bad repute, male audire: to get on badly, male proficere in aliqua re. According to Döderlein, malus homo is a morally bad man; but nequam, a good-for-nothing man, whose faultiness shows itself in aversion to useful labor, and a propensityto roguish tricks, in opposition to frugi; pravus, a man whose character has taken a vicious direction, in a physical, or intellectual, or moral point of view, in opposition to rectus (Hand-book, p. 131): bad times, tempora iniqua, aspera, luctuosa; temporum iniquitas; temporum calamitates (the badness of the times): bad news, nuncius tristis, acerbus: to hear bad news, malum nuncium audire: a bad wife, mulier or uxor saeva, incommoda et importuna; bad company, socii mali: to set a bad example, esse exempli mali: to try to mend a bad business, rem proclinatam adjuvare.
With reference to health :aeger (bad in health), aegor atque invalidus: very bad, gravi et poricuioso morbo aeger: to fall into a bad state of health, in adversam valetudinem indicere: to be bad again, in morbum recidere; de integro in morbum incidere: to be bad or sick, aegrotare (opposed to valere); aegrotum esse; in morbo esse; morbo laborare or affectum esse; valetudine affectum esse; morbo vexari, or conflictari, iniqua valetudine conflictari: to be very bad, graviter or gravi morbo aegrum esse. Vid: SICK.

Quick answer

What is the Latin word for bad?
The usual Latin words for “bad” are malus, prāvus, aeger; also advertō, foedus, incommodus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.