but

However, although, nevertheless, on the other hand (introducing a clause contrary to prior belief or in contrast with the preceding clause or sentence).

On the contrary, rather (as a regular adversative conjunction, introducing a word or clause in contrast or contradiction with the preceding negative clause or sentence).

(colloquial) Used at the beginning of a sentence to express opposition to a remark.

Except 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".

(colloquial) Used to link an interjection to the following remark as an intensifier.

(archaic) Without it also being the case that; unless that (introducing a necessary concomitant).

(obsolete) Except with; unless with; without.

(obsolete) Only; solely; merely.

(obsolete) Until.

(obsolete, following a negated expression of improbability) That.