What is the Latin word for rigorously?

The usual Latin words for “rigorously” are sevērus, rigidus, ācer; also acerbus, austērus, dīligenter. The right choice depends on the sense; see the distinctions below.

English → Latin

“rigorously” in Latin

sevērussevere, serious, strict, stern, stringent, austere, harsh, grave (in demeanor)rigidusstiff, rigid, hard, inflexible; stern, strict, severe, hard, inflexible ācersharp, sour, bitter, pungent; keen, sharp, acute, sagacious; energetic, active, vigorous acerbusharsh, bitter, unripe, sour, premature, not yet marriageable; sharp, severe, bitter (i.e., extremely painful); rough, vi austērusaustere, plain; harsh, bitter, sour; sharp, pungent, tart dīligenterdiligently, carefully

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

rigorously

severe: rigide: acriter: acerbe: austere: diligenter. SYN. in SEVERELY.

Quick answer

What is the Latin word for rigorously?: The usual Latin words for “rigorously” are sevērus, rigidus, ācer; also acerbus, austērus, dīligenter. 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.