Moving or operating slowly; having a slow speed or sluggish reaction.
このパソコンは古くて動作が遅い。
This computer is old and runs slowly.
彼は判断が遅いので、決断に時間がかかる。
He is slow to judge things, so decisions take time.
エレベーターの反応が遅いから階段で上ろう。
The elevator responds slowly, so let's take the stairs.
Being late in time; arriving, starting, or ending later than expected.
今日は仕事が長引いて帰るのが遅い。
Work ran late today, so I'll be home late.
約束の時間に遅いと相手に迷惑がかかる。
Being late for an appointment inconveniences the other person.
夜遅いから外で遊ぶのはやめよう。
It's late at night, so let's not play outside.
Too late; a situation where it is already past the point of being able to do something (often used as もう遅い / もはや遅い).
その知らせが届いたとき、もう遅いと分かった。
When the news arrived, we realized it was already too late.
もはや遅い。手を打つならもっと早くすべきだった。
It's already too late. If we were going to act, we should have done it earlier.