What is the Latin word for unbeliever?

The usual Latin words for “unbeliever” are īnfidēlis, Salvĭānus, Lactantius. The right choice depends on the sense; see the distinctions below.

English → Latin

“unbeliever” in Latin

īnfidēlisunfaithful; treacherous, disloyal; unbelieving, infidel Salvĭānusnamed from one Salvius LactantiusA masculine cognomen — famously held by

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

unbeliever

qui non facile adduci potest, ut credat (general term): *qui veram religionem non profitetur (in the Christian sense). Unbelievers, barbari Christum aversantes (of barbarous nations); infideles (ecclesiastical, Salvianus, Augustin): injusti ac Deum nescientes (Lactantius).

Quick answer

What is the Latin word for unbeliever?: The usual Latin words for “unbeliever” are īnfidēlis, Salvĭānus, Lactantius. 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.