1. fast, quick, rapid, swift, speedy, brisk, prompt

adjective (keiyoushi)

2. early, soon, earlier than usual

adjective (keiyoushi)

3. premature, too soon, too early

adjective (keiyoushi)

4. easy, simple, quick, fast

adjective (keiyoushi)

5. as soon as ..., the moment ..., the instant ...

adjective (keiyoushi)