LATIN DICTIONARYLexicon Latīnum
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“unequal” in Latin

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

unequal
impar (denotes inequality as to quantity, either arithmetically [= odd, of numbers], or as involving a relative weakness): dispar (refers to quality, without distinguishing on which side of the comparison the advantage lies; but also used generally, dispares cicutae, of unequal length, Verg.): inaequalis (general term; opposed to sequus, equal; e.g., of the sides of a triangle; then IMPROP. of what is not regular, auctumni, etc.): disparilis (very rare, but classical; aspiratio terrarum, Cic.; pabulum; formae, Varr.; vites, Col.). Equal in boldness, unequal in prudence, par audacia, consilio impar: unequal in numbers, nequaquam numero pares. Unequal (of things relatively to each other), dispares inter se.
Not equal to a task, imparem esse alicui rei (opposed to parem esse; e.g., negotiis): aliquid sustinere non posse (e.g., molem): alicujus vires non sufficiunt (Caes., ; ad aliquid, Quint.): aliquid ferre non posse (e.g., to be unequal to the labor, ferre operis laborem non posse, Caes.).
Unequal marriages, impares nuptiae. Because she had made an unequal marriage, quod juncta impari esset (i. e., with a person of inferior rank, Liv., 6, 349).

Quick answer

What is the Latin word for unequal?
The usual Latin words for “unequal” are impār, dispār, inaequālis; also disparilis, auctumnus, pābulum. 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.