Answer:

ICIEST

Answer	Crossword Clue
ICIEST	Most slick, in a way
ICIEST	Most treacherous for driving
ICIEST	Least friendly

ICIEST	Least affable
ICIEST	Least cordial
ICIEST	Furthest from tropical
ICIEST	Superlatively frosted
ICIEST	Most slippery, on the road
ICIEST	Most unfriendly
ICIEST	Most distant
ICIEST	Least hospitable

ICIEST	Most aloof
ICIEST	Most frigid
ICIEST	Most standoffish
ICIEST	Hardest to get close to
ICIEST	Most slippery
ICIEST	Most frosty
ICIEST	Superlatively aloof
ICIEST	Most arctic.

ICIEST	Most frigid.
ICIEST	Most snobbish.
ICIEST	Coldest.
ICIEST	Most glacial.
ICIEST	Most unfriendly.
ICIEST	Coolest.
ICIEST	Most wintry.
ICIEST	Most aloof.

ICIEST	Coldest
ICIEST	Most wintry
ICIEST	Most gelid
ICIEST	Most chilling
ICIEST	Least amiable
ICIEST	Least emotional
ICIEST	Most reserved
ICIEST	Least welcoming

ICIEST	Most dangerous, as winter roads
ICIEST	Superlatively slippery
ICIEST	Most treacherous for driving, maybe
ICIEST	Most polar
ICIEST	Most chilling?