Answer: steepest

AnswerCrossword Clue
STEEPEST

Most prohibitory in cost

STEEPEST

With the highest gradient

STEEPEST

Most inclined

STEEPEST
Most pricey
STEEPEST
Most precipitous
STEEPESTMost expensive
STEEPESTMost difficult to climb
STEEPESTMost precipitous.
STEEPESTHardest to climb.
STEEPESTMost exorbitant
STEEPESTMost high-priced
STEEPESTLeast gradual
STEEPESTHighest priced
STEEPESTHardest to climb, maybe