Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mĭnĭtābundus, a, um, adj. [minitor], threatening: cum rex … circumdari ignes minitabundus juberet, Liv. 2, 12, 12; 39, 41, 3; Tac. A. 2, 10.