Adjective + suffix = verbPast participle (often used as adjectives) Past participle spelt -nOther adjectives
blacken
crispen
fatten
flatten
freshen
gladden
madden
quicken
redden
sadden
sicken
soften
stiffen
thicken
 
 
brighten
broaden
cheapen
dampen
darken
deafen
deepen
embolden
fasten
frighten
harden
hasten
heighten
lengthen
lessen
lighten
liken
liven
loosen
moisten
neaten
quieten
ripen
sharpen
shorten
slacken
smarten
steepen
straighten
sweeten
roughen
threaten
arisen
awoken
beaten
been
bidden
bitten
broken
chosen
driven
eaten
fallen
forbidden
forgiven
forgotten
frozen
given
gotten
hidden
mistaken
proven
ridden
risen
seen
shaken
smitten
spoken
stolen
striven
taken
trodden
woken
woven
written
blown
flown
grown
known
mown
shown
sown
thrown
brazen
craven
drunken
earthen
flaxen
golden
graven
laden
leaden
misshapen
molten
olden
shaven
shrunken
silken
sunken
swollen
rotten
waxen
wheaten
wooden
woolen (UK)
woollen (US)