to be in poor condition; not functioning well — used for health, machines, plans, moods, etc.
今朝から喉の調子が悪くて声が出にくい。
Since this morning my throat has been bad and it's hard to speak.
車の調子が悪いので、週末に整備工場へ持っていくつもりだ。
My car isn't running well, so I plan to take it to the shop this weekend.
試合で調子が悪い選手はいつもよりミスが多くなる。
A player who's off their game makes more mistakes than usual.
パソコンの調子が悪くて、作業が全然進まない。
My computer is acting up, so I can't get any work done.