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“doubt” in Latin

The English word doubt itself goes back to Latin duo, through dubitō.

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

doubt v.
INTRANS., dubitare: dubium esse: in dubio esse (to be doubtful): dubitatione aestuare (to be in a state of agitating doubt or uncertainty; Vid: Cic., Verr. 2, 30, 74): animo or animi pendere (not to be able to make up one’s mind). To doubt about anything, dubitare de re (not with the accusative, in classical Latin, except of a neuter pronoun.): to doubt a little, subdubitare. I doubt whether, dubito, num, etc. I do not doubt that, etc., non dubito, quin, etc. (☞ not dubito, with the accusative and infinitive, is used in this sense by Nep., but is better avoided; in the sense of “hesitate” it is classical). Doubt not but that I shall do everything, illud cave dubites, quin ego omnia faciam: can you doubt that, etc...? dubitabitis, quin...? ☞ Sometimes “I doubt” is used in the sense of “I fear;” e.g., “I doubt he will not come,” vereor ut veniat. Vid: FEAR.
doubt
TRANS., Mostly by dubitare de aliqua re: to doubt your affection for me, dubitare de tua erga me voluntate (so dubitare de divina ratione; but a neuter pronoun will be in the accusative).
doubt s.
dubitatio (only in the sense of a person’s uncertainty and hesitation as to what he should decide; hence often with quin, ne, num, quidnam): scrupulus (the thing that causes me to doubt and hesitate): difficultas (the difficulty of a thing, as preventing one from getting at the bottom of it): cf., Whenever “doubt” is used to denote that one considers a thing as doubtful, uncertain, etc., the neuter dubium is used; but never substantively with another adjective, Hence, nullum est dubium; sine ullo dubio are barbarous. Without doubt beyond a doubt, sine dubio (☞ not absque dubio); haud dubie; certe (undoubtedly; e.g., haec lectio sine dubio, or haud dubie, vera est; si deus scit, certe illud eveniet); sine ulla dubitatione (without any hesitation; hence, haec lectio sine ulla dubitatione praeferenda est).”Without doubt,” may also be frequently translated by non dubito: without doubt all your friends have written to you, non dubito, quin ad te omnes scripserint: to be in doubt, dubium esse (of persons, and objectively, of things): dubitare (of persons only; subjectively): to be the subject of doubt, dubium esse; dubitari: I have or make no doubt, non, or nihil, dubito (that, but that, quin): doubt is entertained, dubitatur; ambigitur. I am in doubt whether, dubito, num; dubius, or incertus, sum utrum, ... an: there is no doubt that, non est dubium, quin: nemini dubium est, quin. I cannot entertain a doubt that, hoc sine ulla dubitatione confirmaverim (with infinitive): to cast a doubt upon, aliquid in dubium vocare, devocare, or revocare: to entertain a doubt about anything, dubitare de aliqua re (☞ In classical Latin, dubitare does not take an accusative, except that of a neuter pronoun): to put a thing out of doubt, aliquid haud dubium relinquere: to leave in doubt, dubium or in dubio, relinquere: a doubt arises in my mind, dubitatio mihi movetur or affertur; scrupulus mihi injicitur: to remove anybody’s doubt, dubitationem alicui eximere, expellere, or tollere (his hesitation); scrupulum alicui eximere; scrupulum alicui or ex alicujus animo evellere: not to leave the slightest doubt in anybody’s mind, omnem dubitationem alicui tollere.

Quick answer

What is the Latin word for doubt?
The usual Latin words for “doubt” are dubitō, animus, subdubitō; also num, quīn, dubitātiō. 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.