deceitful, devious, lying, shady, underhanded
An opposite of the word "to" is from.
The opposite of up is down. So, opposite of the opposite of up is up itself.
The opposite of the opposite is the original value, -9.
The opposite of arrive is to depart or to leave.The opposite of arrival is departure.
The opposite of 'not in' is 'in'.
The negotiations were honest and aboveboard. They were aboveboard about anything regarding the transaction, but kept the origins a secret.
she acted in a completely open and aboveboard way.
par-dessus bord
It shouldn't. It's an American idiom.
Truthful, aboveboard and forthright are three. Also "up front", but then that is two words.
It refers to the fact that a gambler was expected to keep his hands above the table or board. A gambler whose hands were not above board was possible cheating.
I do not believe that this phrase was meant to be taken literally. It is more likely a metaphor meaning that if you go to court your "hands" (i.e.: background - motives - actions) had better be 'clean,' meaning honest and aboveboard.
The opposite (antonym) of opposite is same.
opposite of opposite to opposite from
An opposite of the word "to" is from.
If you have to be opposite on opposite day, that makes it a day, and then there was no opposite day. But that can't be true since you HAVE to be opposite, which means that you have to be normal even though there is an opposite day because you are supposed to be opposite on opposite day, which means that you act normal as if it was a normal day, because that is the opposite of opposite day. (This is a classic "liar's paradox". Since there is already an opposite day, you should have a normal day because that is the opposite of an opposite day. But then it is not an opposite day.)
You could say that you are being "opposite of how other people are" on Opposite Day. If you say the opposite of an opposite, it is a true expression.