ingratus

From in- (“not”) +‎ grātus (“pleasing”).

• (Classical Latin) IPA^(key): [ɪŋˈɡraː.tʊs]
• (modern Italianate Ecclesiastical) IPA^(key): [iŋˈɡraː.t̪us]

ingrātus (feminine ingrāta, neuter ingrātum, superlative ingrātissimus); first/second-declension adjective

1. unpleasant, disagreeable

   Antonyms: peramoenus, iūcundus, commodus

2. thankless
3. ungrateful
4. fruitless, unsuccessful, sterile.

   Synonyms: incommodus, inūtilis, ineptus, gratuitus, irritus, infelix

   Antonyms: opportūnus, commodus, habilis, idōneus, conveniēns, ūtilis, ūtēnsilis, aptus, salūber

First/second-declension adjective.

• “ingratus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “ingratus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• "ingratus", in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• ingratus in Enrico Olivetti, editor (2003-2025), Dizionario Latino, Olivetti Media Communication
• ingratus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• Carl Meißner, Henry William Auden (1894) Latin Phrase-Book‎^[1], London: Macmillan and Co.
  • gratitude: gratus (opp. ingratus) animus
    
  • a good harvest: messis opīma (opp. ingrata)
    
• “ingratus”, in Harry Thurston Peck, editor (1898), Harper’s Dictionary of Classical Antiquities, New York: Harper & Brothers
• “ingratus”, in William Smith et al., editor (1890), A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin