FAST Synonyms - page 6
posthaste
persistent
permanent
pennate
irremovable
invariable
immediate
hurry
hurrying
hurried
hotfoot
holyday
headlong
hasty
hastily
haste
gymnosophy
gastight
galloping
freck
fortified
immediately
immobile
immoderately
intemperately
intemperate
instantaneous
instant
insecable
inextricable
ineradicably
indissoluble
indelible
incontinently
impregnable
impacted
immune
immovably
immovable
fleetly