Answer: glacial

AnswerCrossword Clue
GLACIAL

Bitterly cold

GLACIAL

Like ice sheets and bergs

GLACIAL

Snail-like

GLACIAL
Really slow
GLACIAL
Describing the Pleistocene epoch.
GLACIALCold as ice.
GLACIALCold and hard.
GLACIALFreezing cold.
GLACIALPertaining to ice floes.
GLACIALChilling
GLACIALNot just slow
GLACIALBeyond slow
GLACIALFrigid
GLACIALIcy
GLACIALPainfully slow