Answer:

soonest

Answer	Crossword Clue
SOONEST	At the first opportunity
SOONEST	Earliest
SOONEST	Most promptly

SOONEST	Earliest time
SOONEST	With the least delay
SOONEST	At the earliest date
SOONEST	Most quickly
SOONEST	Haste-encouraging word
SOONEST	Happening first
SOONEST	Most quickly.
SOONEST	At the earliest possible time, in telegraphese.

SOONEST	Cablese word requesting great haste.
SOONEST	With least delay, in cablese.
SOONEST	Telegraphic word, requiring action now.
SOONEST	"Least said ... mended."
SOONEST	Pronto.
SOONEST	"Least said, ... mended"
SOONEST	Next available
SOONEST	Quick as can be

SOONEST	How urgent tasks should be done
SOONEST	Least delayed
SOONEST	As quickly as possible
SOONEST	At the earliest opportunity
SOONEST	Next
SOONEST	Immediately
SOONEST	Earliest date
SOONEST	First to arrive