Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word vacillabat could not be parsed. Trying a normal dictionary lookup:
No entries found. Showing closest matches:
văcillātĭo, ōnis, f. [vacillo], a rocking to and fro, see-saw, a wavering, reeling motion: indecora in dextrum ac laevum latus, Quint. 11, 3, 128: foeda, Suet. Claud. 21 fin.