Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
bĕātĭtūdo, ĭnis, f. [beatus], the condition of beatus, happiness, felicity, blessedness, beatitude; a word coined by Cic.; cf. beatitas, and pass. there cited. In the post-Aug. per. several times: animi, Petr. 8, 5: vitae, App. M. 6; Mamert. Grat. Act. ad Julian. 23 al.; Cod. 12, 47, 1; Vulg. Gen. 30, 13; id. Gal. 4, 15.