Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
in-fēlīcĭtas, ātis, f. [infelix], ill-luck, misfortune (rare but class.): quid hoc infelicitatis? Ter. Ad. 4, 5, 5: haruspicum, Cic. Div. 2, 29 fin.: gravior, Liv. 40, 55 fin. al.
Plur.: miseriae et infelicitates, calamities, App. Dogm. Plat. 2, p. 17, 37.
infēlīcĭto (or infēlīco, v. infra), āre, 1, v. a. [infelix], to render unhappy, make wretched, plague (ante-class.): di me et te infelicitent, Plaut. Cas. 2, 3, 30 (Ritschl et MSS.; al. infelicent): Hercle illum infelicitent di, id. Merc. 2, 3, 99 (Ritschl; al. infelicent): ut te di omnes infelicitent, Caecil. ap. Non. 126, 26 (but Com. Fragm. v. 114 Rib., infelicent).
Form infelico: di illum infelicent omnes, Plaut. Poen. 2, 1, 1.