hard-line
hardline
robust
rugged
adamantine
athletic
beefy
bouncing
brawny
bulky
burly
dense
determined
doughty
durable
enduring
firm
firm as Gibraltar
flush
forceful
forcible
forcy
full-blooded
full-strength
gutsy
gutty
hale
hale and hearty
hard
hard as nails
hardy
hearty
heavy
hefty
husky
indomitable
infrangible
iron-hard
lasting
lusty
made of iron
massive
mighty
muscular
nervy
obstinate
potent
powerful
puissant
red-blooded
sturdier
sturdiest
sturdied
sturdies
brave
healthy
slender
stout
tall
wooden
Ciardi
Verde
birdie
birdy
nerdy
purdy
thirty
wordy