- without any delay
"he was killed outright"

- without delay or hesitation

- with no time intervening
"he answered immediately"
"found an answer straightaway"
"an official accused of dishonesty should be suspended forthwith"
"Come here now!"

1. Without the least delay or interval; at once; immediately. Macaulay.

2. With urgency or importunity; earnestly; pressingly. "They besought him instantly." Luke vii. 4.

Syn. -- Directly; immediately; at once. See Directly.