ill-natured
obstinate
stubborn
unpleasant
unregenerate
Spartan
Spartanic
adamant
adamantine
astringent
austere
authoritarian
beetle-browed
black
black-browed
bleak
bold
cast-iron
cheerless
cold
crabbed
dark
dejected
demanding
dismal
dreary
dumpish
exacting
exigent
firm
flinty
forbidding
frowning
fundamentalist
gloomy
glowering
glum
grim
grum
hard
hard-core
hard-nosed
hardy
harsh
hidebound
immovable
immutable
implacable
impliable
despondent
disapprove
grizzle
gruff
haggard
haughty
impassive
inscrutable
morose
sardonic
somber
sour
stolid
surly
thoughtful
unsmiling
Auer
Bower
Gower
Power
bour
bower
cower
dauer
devour
dower
empower
flour
flower
glower
hour
hower
jour
lour
mph
our
overpower
power
scour
shower
superpower
tower