Immediately, without delay

तुरंत

English Usage: She responded instantly to the message.

Hindi Usage: उसने संदेश का तुरंत जवाब दिया।

Happening or done immediately

तात्कालिक

English Usage: I need an instant solution to this problem.

Hindi Usage: मुझे इस समस्या का तात्कालिक समाधान चाहिए।