1. in a way that is opposite to what was intended, expected, or arranged
Contrary to plan, the meeting was cancelled due to the storm.
Contrariamente ao plano, a reunião foi cancelada devido à tempestade.
2. happening in a manner that does not follow the predetermined schedule or arrangement
Contrary to plan, we arrived three hours earlier than scheduled.
Contrariamente ao plano, chegámos três horas mais cedo do que estava previsto.