Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
āthlētĭcē, adv., v. athleticus fin.
† āthlētĭcus, a, um, adj., = ἀθλητικός, of or pertaining to the athlete, athletic (not in Cic.): victus, Cels. 4, 6 fin.: ars, Gell. 15, 16, 2; also without ars: āthlētĭca, ae, f., the athletic art, athletics, Plin. 7, 56, 57, § 205.
Adv.: āthlētĭcē, athletically, only in Plaut.: Pancratice atque athletice (valuit), Plaut. Bacch. 2, 3, 14: Valet pugilice atque athletice, id. Ep. 1, 1, 18.