LATIN DICTIONARYLexicon Latīnum
adjectivefirst/second-declension adjective

indēfessus

indēfessus (feminine indēfessa, neuter indēfessum, adverb indēfessē or indēfessim)
Classical[ɪn.deːˈfɛs.sʊs]Ecclesiastical[in.deˈfɛs.sus]

Meaning

  1. adjectiveunwearied, indefatigable

Declension

singular
formmasculinefeminineneuter
nominativeindēfessusindēfessaindēfessum
genitiveindēfessīindēfessaeindēfessī
dativeindēfessōindēfessaeindēfessō
accusativeindēfessumindēfessamindēfessum
ablativeindēfessōindēfessāindēfessō
vocativeindēfesseindēfessaindēfessum
plural
formmasculinefeminineneuter
nominativeindēfessīindēfessaeindēfessa
genitiveindēfessōrumindēfessārumindēfessōrum
dativeindēfessīsindēfessīsindēfessīs
accusativeindēfessōsindēfessāsindēfessa
ablativeindēfessīsindēfessīsindēfessīs
vocativeindēfessīindēfessaeindēfessa

in-dēfessus, a, um, adj.,
I. unwearied, indefatigable (poet. and post-Aug.): dextra, Verg. A. 11, 651: agendo, Ov. M. 9, 199: assiduus et indefessus, Tac. A. 16, 22: Germani ob prospera indefensi, id. ib. 1, 64.— Hence, indēfessē and indēfessim, advv., unweariedly (both post-class.).
(a). Form indefesse: et benigne agere omnia, Aus. Grat. Act. 35; Spart. Hel. 5, 10.—
(b). Form indefessim: expetere bonorum amicitias, Sid. Ep. 3, 2; Claud. Mam. Stat. Anim. 1, 7.

Origins

  1. Proto-Indo-European*né
  2. Proto-Indo-European*n̥-
  3. Proto-Italic*n̥-
  4. Latinindēfessus

Latin dēfessus Latin indēfessus From in- + dēfessus (“exhausted”).

Quick answers

What does indēfessus mean in Latin?
indēfessus, a adjective, means “unwearied, indefatigable”.
How do you pronounce indēfessus?
In classical Latin, [ɪn.deːˈfɛs.sʊs]; in ecclesiastical (church) Latin, [in.deˈfɛs.sus].
Where does indēfessus come from?
Proto-Indo-European *né → Proto-Indo-European *n̥- → Proto-Italic *n̥- → Latin indēfessus.