hard
Philistine
Quaker-colored
acier
adamant
adamantine
ashen
ashy
aureate
beefy
bony
bouncing
brass
brassy
brazen
bronze
bronzy
callous
calloused
canescent
case-hardened
cast-iron
cement
cemental
cinereous
cinerous
concrete
constant
copper
coppery
corneous
cupreous
cuprous
dapple
dapple-gray
dappled
dappled-gray
dense
diamondlike
dingy
dismal
doughty
dour
dove-colored
dove-gray
dreary
dull
dure
dusty
ferrous
ferruginous
baleful
bluish
expressionless
flinty
frosty
glassy
icy
implacable
leaden
livid
ominous
pearly
sightless
silvery
somber
unblinking
unearthly
unflinching
unyielding
watery
Greeley
Keeley
Swahili
dealy
feely
freely
ideally
mealy
really
seely
sheely