adjective

opposite in nature, direction, or meaning.

he ignored contrary advice and agreed on the deal

opposite,opposing,opposed,contradictory,clashing,conflicting,antithetical,incompatible,irreconcilable,different,differing,contrasting,inconsistent,incongruous,reverse,counter,backasswards,oppugnant,antipathic

noun

the opposite.

an Act applies only to the United Kingdom unless the contrary is expressed

opposite,reverse,converse,antithesis,contrariety