Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
dē-servĭo, īre, v. n., to serve zealously, be devoted to, subject to (rare, but class.): valetudini tuae, dum mihi deservis, servisti non satis, Cic. Fam. 16, 18: cuivis, id. Off. 1, 30, 109: amicis, id. Sull. 9: grammatico soli deserviamus, deinde geometrae? Quint. 1, 12, 6: (Epicurei) sibi indulgentes et corpori deservientes, Cic. Leg. 1, 13, 39: studiis, Plin. Ep. 7, 7, 3: honoribus, id. Pan. 77, 6: Deo meo, Vulg. Act. 24, 14.