Synonyms for Nonparallel (same or very similar meaning)
WordNet sense 1 (of or relating to the sequential performance of multiple operations):
serialWordNet sense 2 (not synchronous; not occurring or existing at the same time or having the same period or phase):
asynchronousWordNet sense 3 (slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled):
obliqueFrom the ODE community, based on WordNetadd/edit