Contrary
Part of speech: adjective
Definition: opposed in nature strongly dissimilar
Part of speech: adverb
Definition: Contrarily
Part of speech: noun
Definition: The opposite. One of a pair of propositions that cannot both be simultaneously true.
Example sentence: There are two possible outcomes: if the result confirms the hypothesis, then you've made a measurement. If the result is contrary to the hypothesis, then you've made a discovery.
Opposite
Part of speech: adjective
Definition: located directly across from something else, or from each otherfacing in the other directionof either of two complementary or mutually exclusive things
Part of speech: adverb
Definition: in an opposite position
Part of speech: preposition
Definition: facing, or across fromin a complementary role to
Part of speech: noun
Definition: something opposite or contrary to anotheran opponentan antonyman additive inverse
Example sentence: Your entire life only happens in this moment. The present moment is life itself. Yet, people live as if the opposite were true and treat the present moment as a stepping stone to the next moment - a means to an end.