preposterous - Contrary to reason or common sense; utterly absurd or ridiculous.
When Sandy's stock broker called and suggested that he sell half his stocks because he felt the market was overvalued, Sandy thought the idea was preposterous - but it turned out that his stock broker was right.
rendezvous - An arrangement to meet somebody at a particular time and place, especially between people who have great affection towards each other.
After Romeo and Juliet met at the masked ball, they arranged a rendezvous in the garden to continue their relationship.