Lewis & Short

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1. incestus, a, um, adj. [2. in-castus], unclean (in a moral and religious sense), impure, polluted, defiled, sinful, criminal (as an adj. mostly poet. and in post-Aug. prose).

  1. I. In gen.: cum verborum contumeliis optimum virum incesto ore lacerasset, Cic. Phil. 11, 2, 5: saepe Diespiter Neglectus incesto addidit integrum, punished the good with the bad, Hor. C. 3, 2, 30: catervae Incestarum avium, that feed on corpses, Stat. Th. 9, 27: profana illic omnia, quae apud nos sacra: rursum concessa apud illos, quae apud nos incesta, Tac. H. 5, 4: an triste bidental Moverit incestus, impious, Hor. A. P. 472.
  2. II. In partic., unchaste, lewd, incestuous.
    1. A. Adj.: Ilion Fatalis incestusque judex … vertit In pulverem, i. e. Paris, Hor. C. 3, 3, 19; called also: praedo, Stat. Ach. 1, 45: princeps, Plin. Pan. 52, 3: amores, Hor. C. 3, 6, 23; Tac. A. 12, 4: nuptiae, id. ib. 11, 25 fin.; cf. conjugia, Suet. Claud. 26: noctes, Plin. Pan. 63, 7: voces, Ov. Tr. 2, 503: pellicere aliquem incesto sermone, Liv. 8, 28, 3: incestus manus intra terminos sacratos inferre, id. 45, 5, 7: corruptor et idem incestus, Juv. 4, 9.
      Hence,
    2. B. Substt.
      1. 1. incestum, i, n., unchastity, lewdness; esp. as a violation of religious laws, incest (class.): incestum pontifices supremo supplicio sanciunto, Cic. Leg. 2, 9, 22: concubuit cum viro … fecit igitur incestum, id. Inv. 1, 40, 73. committere, Quint. 4, 2, 88; Dig. 23, 2, 39: ex incesto, quod Augustus cum Julia filia admisisset, Suet. Calig. 23; cf.: incesti cum sorore reus, id. Ner. 5: cum filia commissum, Quint. 5, 10, 19: incesto liberatus, Cic. Pis. 39, 95: incesti damnata, Quint. 7, 8, 3: ab incesto id ei loco nomen factum, Liv. 8, 15, 8: incesti poena … in viro in insulam deportatio est, Paul. Sent. 2, 26, 15.
        In plur.: stupra … et adulteria, incesta denique, Cic. Tusc. 4, 35, 75: super sororum incesta, Suet. Calig. 36: Vestalium virginum, id. Dom. 8.
      2. 2. incesta, ae, f., an incestuous woman, paramour: hunc (adamanta) dedit olim barbarus incestae, Juv. 6, 158.
        Adv.: incestē (incastē, Sen. Contr. 2, 13).
    1. A. In gen., impurely, sinfully, Lucr. 1, 98: facere sacrificium Dianae, Liv. 1, 45, 6.
    2. B. In partic., unchastely: ideo aquam adduxi, ut ea tu inceste uterere? Cic. Cael. 14, 34: libidinatum, Suet. Ner. 28: agit incestius res suas, Arn. 5, 170.

2. incestus, ūs, m. [1. incestus, II.], unchastity, incest (mostly Ciceron.): quaestio de incestu, Cic. Mil. 22, 59; id. Brut. 32, 122; 124; id. N. D. 3, 30, 74 Klotz; Liv. 4, 44 Weissenb.; Val. Max. 6, 3, 7.