Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
spectātīvus, a, um, adj. [specto], contemplative, speculative: thesin a causā sic distinguunt, ut illa sit spectativae partis, haec activae, Quint. 3, 5, 11: opp. actualis, Isid. 2, 24, 9.