1.conjunctionOn the contrary, rather (as a regular adversative conjunction, introducing a word or clause in contrast or contradiction with the preceding negative clause or sentence).
"I am not rich but [I am] poor not John but Peter went there."
2.conjunctionHowever, although, nevertheless, on the other hand (introducing a clause contrary to prior belief or in contrast with the preceding clause or sentence).
"She is very old but still attractive."
3.conjunctionExcept that (introducing a subordinate clause which qualifies a negative statement); also, with omission of the subject of the subordinate clause, acting as a negative relative, "except one that", "except such that".
"I cannot but feel offended."
4.conjunctionWithout its also being the case that; unless that (introducing a necessary concomitant).
"It never rains but it pours."
5.conjunctionExcept with; unless with; without.
6.conjunctionOnly; solely; merely.
7.conjunctionUntil.
8.conjunction(following a negated expression of improbability) That.