I-adjective (keiyoushi)
fast; quick; rapid; swift; speedy; brisk; prompt
esp. 速い
あれは世界で最も速い電車です。That is the fastest train in the world. early; soon; earlier than usual
premature; too soon; too early
easy; simple; quick; fast
esp. 早い
as soon as ...; the moment ...; the instant ...
as ...するが早いか or ...するより早く
Also written 速い【はやい】、疾い【はやい】、捷い【はやい】