What is the Latin word for unreasonably?

The usual Latin words for “unreasonably” are inīquus, iniūria, dēmentō; also īnsānus. The right choice depends on the sense; see the distinctions below.

English → Latin

“unreasonably” in Latin

inīquusunjust, unfair; unequal, uneven; unfavourable, disadvantageous iniūriainjury, wronging, offense, insult, wrong; injustice, wrongdoing; damage, harm, hurt, injury dēmentōto make mad or crazy, drive crazy; to bewitch; to delude īnsānusmad, insane, demented

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

unreasonably

inique (unfairly): injuria (wrongfully; opposed to jure): nulla ratione: dementer: insane (madly).

Quick answer

What is the Latin word for unreasonably?: The usual Latin words for “unreasonably” are inīquus, iniūria, dēmentō; also īnsānus. 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.