Fast

しっかりした

shikkari shita

(firmly or securely fixed in place)

早い

hayai

(ahead of the correct time or schedule)

速い

hayai

(moving or capable of moving with great speed)

しっかりと

shikkari to

(in a firm or secure manner)

急いで

isoide

(with great speed)

速く

hayaku

(with great speed)

断食する

danjiki-suru

(to abstain from food)