固然
gùrán · HSK 7
although
固 = solid/firm + 然 = thusly; 'firmly so' → admittedly, granted
固 means solid/firm (cf. 固定 fixed); 然 means thusly/so (cf. 当然 of course). Together 'firmly thus' = 'it is indeed so, but...' — the concessive 'though/admittedly' that sets up a contrast.