Not unless you consider, say, Warren Buffett “partisan” or “ideological.”
unless a client has behaved badly or violently, his privacy is usually respected.
Pursue a diplomatic path and avoid fighting, unless you have to, in which case take out whoever is necessary without prejudice.
unless Romney badly stumbled, there was not going to be room for Huntsman—and Romney did not stumble.
unless we neutralize the air assets with the no-fly zone, this bleeding will continue.
Not the sky, assuredly, and there was no place else possible, unless the door of the summer house.
unless we are fortunate enough to find some, retreat is inevitable.
Another half-hour, and—unless help arrived—every passenger must swim for it.
unless you do as I bid you, I will keep you in irons for the rest of the voyage!
He had never been seen to spend a penny, unless it was to save twopence.
mid-15c., earlier onlesse, from on lesse (than) "on a less condition (than)," the first syllable originally on, but the negative connotation and the lack of stress changed it to un-.