But, ante, and before are all synonyms for unless. If and whenever are antonyms of unless. And here are 26 another word for unless.
Ante, before, but, earlier than, except for, except, excepting that, if not, in advance of, lest, nisi, pending, pre, previous to, prior to, saving, till, until such time as, until, up till, up to the time of, up to the time that, up until, without, and up to
are all synonyms for unless.
Unless synonym page has a variety of synonyms that differ in length. 2 synonyms with 3, 5, 11, 13, and 15 letters and 4 synonyms with 4, 6, and 7 letters. 1 synonym with 9, and 10 letters. For a total of 24 another word for unless.
I won't go unless you invite me.
Unless it rains, we'll have a picnic.
She won't leave unless he apologizes sincerely.
We can't proceed unless you approve it.