What is the Latin word for ruthlessly?

The usual Latin words for “ruthlessly” are inclēmēns, acerbus, ācer; also crūdēlis. The right choice depends on the sense; see the distinctions below.

English → Latin

“ruthlessly” in Latin

inclēmēnsharsh (all senses)acerbusharsh, bitter, unripe, sour, premature, not yet marriageable; sharp, severe, bitter (i.e., extremely painful); rough, vi ācersharp, sour, bitter, pungent; keen, sharp, acute, sagacious; energetic, active, vigorous crūdēlisunfeeling, rude; ruthless, cruel, merciless

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

ruthlessly

inclementer: acerbe: acriter: crudeliter [SYN. in HARD]: to exact money ruthlessly, acerbissime pecunias exigere.

Quick answer

What is the Latin word for ruthlessly?: The usual Latin words for “ruthlessly” are inclēmēns, acerbus, ācer; also crūdēlis. 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.