Synonyms for Inverse (same or very similar meaning)
WordNet sense 1 (something inverted in sequence or character or effect):
oppositeWordNet sense 2 (of or relating to the multiplicative inverse of a quantity or function):
reciprocalWordNet sense 3 (reversed (turned backward) in order or nature or effect):
reverseWordNet sense 4 (directed or facing toward the back or rear):
backwardFrom the ODE community, based on WordNetadd/edit