adverb

used to introduce a statement that contrasts with or seems to contradict something that has been said previously.

People tend to put on weight in middle age. However, gaining weight is not inevitable

but,nevertheless,nonetheless,still,yet,though,although,even so,(but) for all that,(but) despite that,(but) in spite of that,anyway,anyhow,be that as it may,having said that,notwithstanding,still and all,howbeit,withal,natheless