toughening
up the ante
toughen
forharden
toughen up
hardening
induration
tough
go to the trouble
indurate
effort
harden
queer someone's pitch
tighten
difficultate
tightening
trickiness
with difficulty
testing
break a sweat
make hard work of
overcomplicate
deepen
perplex
heave
toughenable
tough as nails
complicate
glove
tough nut to crack
ambitious
bid
hard nut to crack
mean
pep up
challenging
outstrain
fan the flames
go for it
Matterhorn
challenge
toughly
mountain to climb
go out of one's way
bronze
superchallenge
extensification
marathonic
overchallenge
hard-bitten
hardened
do one's utmost
effectivization
outwork
hard-boiled
daunting
put a hurt on
bolsterment
boil the ocean
cram
pugnacious
hard yards
make a meal of
outshove
give it some welly
go for
ultratough
plosivization
agonistic
pain point
hard-set
throw down the gauntlet
pull teeth
try for
give it one's best shot
put a shift in
strugglingly
kysolamniphic
difficult
better
amend
muscle up
dead set
ameliorate
bring off
impeded
meliorate
enharden
improve
sink
betterfy
testing
toughenable
tough as nails
ambitious
mean
marathonic
hard-bitten
hardened
hard-boiled
daunting
pugnacious
ultratough
agonistic
hard-set
kysolamniphic
difficult
impeded
toughly
strugglingly
toughening
hardening
induration
tightening
trickiness
glove
tough nut to crack
hard nut to crack
challenging
mountain to climb
superchallenge
extensification
overchallenge
effectivization
bolsterment
hard yards
plosivization
pain point
dead set
challenge
up the ante
toughen
forharden
toughen up
tough
go to the trouble
indurate
effort
harden
queer someone's pitch
tighten
difficultate
break a sweat
make hard work of
overcomplicate
deepen
perplex
heave
complicate
bid
pep up
outstrain
fan the flames
go for it
challenge
go out of one's way
bronze
do one's utmost
outwork
put a hurt on
boil the ocean
cram
make a meal of
outshove
give it some welly
go for
throw down the gauntlet
pull teeth
try for
give it one's best shot
put a shift in
better
amend
muscle up
ameliorate
bring off
meliorate
enharden
improve
sink
betterfy
English words for 'The process of making something tougher.'
As you may have noticed, above you will find words for "The process of making something tougher.". Hover the mouse over the word you'd like to know more about to view its definition. Click 
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