What is the Latin word for effectually?

The usual Latin words for “effectually” are efficienter, efficāx, prosperus; also potenter. The right choice depends on the sense; see the distinctions below.

English → Latin

“effectually” in Latin

efficienterefficiently, effectively efficāxefficacious, effectual, powerful, efficient prosperusprosperous, successful; favourable, propitious potenterpowerfully, forcefully; effectively

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

effectually

efficienter (Cic.); efficaciter (Sen., Plin.): non frustra (not in vain): prospere (successfully): potenter (powerfully; Quint.).

Quick answer

What is the Latin word for effectually?: The usual Latin words for “effectually” are efficienter, efficāx, prosperus; also potenter. 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.