1. (a.) Opposite in order, relation, or effect; reversed; inverted; reciprocal; -- opposed to direct\.

2. (a.) Inverted; having a position or mode of attachment the reverse of that which is usual.

3. (a.) Opposite in nature and effect; -- said with reference to any two operations, which, when both are performed in succession upon any quantity, reproduce that quantity; as, multiplication is the inverse operation to division. The symbol of an inverse operation is the symbol of the direct operation with -1 as an index. Thus sin-1 x means the arc whose sine is x.

4. (n.) That which is inverse.

adversative adverse adversive antagonistic anti antipathetic antipodal antipode antipodes antipole antithesis antithetic antonym antonymous at cross-purposes balancing change clashing compensating conflicting confronting contra contradictory contradistinct contrapositive contrarious contrary contrasted converse counter counterbalance counterbalancing countercheck counterpoint counterpoise counterpoised counterpole counterterm countervailing dead against discordant discrepant eyeball to eyeball eyeball-to-eyeball facing foil heads hostile inconsistent inimical invert obverse offset opposed opposing opposite opposite number opposite side oppositional oppositive oppugnant other face other side perverse polar polaric polarized repugnant reverse revert setoff squared off tails the contrary the other side transplace transpose turn vis-a-vis