Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
non-numquam or -nunquam, adv., sometimes; opp. numquam, Cic. Vatin. 2, 5; with aliquando, id. Fam. 5, 8, 2: nonnumquam interdiu, saepius noctu, Caes. B. G. 1, 8 fin.