pleasant, pleasing, comfortable, enjoyable / fast, quick (in a pleasing way) / sharp (of knives); clever (of wits) / recovery (from illness, of health)

(literary) pleasure; delight; enjoyment

pleasant / refreshing

pleasant / comfortable / easy / quick / fast / light / cheerful / happy

drink

a flight / mail / (bus) service

A substance with mystical properties, especially one that has an effect on the body, health, or lifespan.

convenient

convenient

a convenience / facilities / bowel movement