LATIN DICTIONARYLexicon Latīnum
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“perfect” in Latin

The English word perfect itself goes back to Latin faciō, through perfectus.

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

perfect
plenus (general term, having its full number, size, etc): integer (whole, unmutilated, etc.): absolutus: perfectus. (The words are found in this connection and order.) absolutus et perfectus: perfectus atque absolutus: expletus et perfectus: perfectus cumulatusque: perfectus completusque (that has the highest perfection): verus: germanus (real, genuine): thoroughly perfect, absolutus omnibus numeris: perfectus expletusque omnibus suis numeris et partibus: totus (whole, opposed to the single parts): totus integer (in the fullest manner or sense; Gell., 12, 1, in.): a perfect duty, perfectum absolutumque officium: perfect virtue, perfecta cumulataque virtus: a perfect orator, orator plenus atque perfectus; perfectus homo in dicendo et perpolitus: more perfect, perfectior (e.g., perpolitius aliquid perfectiusque, Cic.): most perfect, summus et perfectissimus (Cic.). Anything is perfect madness, aliquid summae est dementiae (e.g., exspectare, dum, etc.): a perfect philosopher, philosophus absolutus: a perfect orator, orator perfectus; homo perfectus in dicendo: a perfect Stoic, perfectus Stoicus (that can not be found fault with): germanissimus Stoicus (deviating in nothing from the Stoic school): to make anything perfect, absolvere (to accomplish anything, so that nothing is wanting in it; e.g., a benefaction, beneficium): cumulare aliquid (to put the finishing stroke to a thing, to crown it; e.g., joy, gaudium).
perfect v.
perficere; conficere; absolvere. (The words are found in this connection and order.) absolvere et perficere. Vid: To COMPLETE.

Quick answer

What is the Latin word for perfect?
The usual Latin words for “perfect” are plēnus, integer, absolvō; also perficiō, vērus, germānus. 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.