Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
contentĭōsus, a, um, adj. [contentio], pertaining to contention, contentious, disputatious, headstrong, obstinate, pertinacious (mostly post-class.): contentiosa et pugnax oratio, Plin. Ep. 2, 19, 4: jurisdictio, Dig. 1, 16, 2.
Comp.: quid contentiosius, quam, etc., Aug. Ep. 174: pernicies, obstinate, App. M. 8, p. 202, 23.
Adv.: con-tentĭōsē, pertinaciously, obstinately: dicere, Hier. ad Jovin. 2, 10.
Comp.: loqui, Quint. Decl. 18, 6.
Sup., Aug. Civ. Dei, 20, 1.