Antonym of IMMEDIATE

Answer: Option D

Immediate : occurring or done at once; instant.
Delayed : make (someone or something) late or slow.
Gradual : taking place or progressing slowly or by degrees.
Leisurely : acting or done at leisure; unhurried or relaxed.
Slow : moving or operating, or designed to do so, only at a low speed; not quick or fast.

Antonym of Immediate is Slow