一个形容词加了en 变为动词的有哪些?_

略举几例:
awake
-
awaken
bright
-
brighten
broad
-
broaden
cheap
-
cheapen
damp
-
dampen
dark
-
darken
dead
-
deaden
deaf
-
deafen
deep
-
deepen
fat
-
fatten
flat
-
flatten
fresh
-
freshen
glad
-
gladden
hard
-
harden
less
-
lessen
light
-
lighten
loose
-
loosen
mad
-
madden
moist
-
moisten
neat
-
neaten
quick
-
quicken
quiet
-
quieten
red
-
redden
ripe
-
ripen
rough
-
roughen
sad
-
sadden
sharp
-
sharpen
short
-
shorten
sick
-
sicken
slack
-
slacken
smart
-
smarten
soft
-
soften
steep
-
steepen
stiff
-
stiffen
straight
-
straighten
sweet
-
sweeten
thick
-
thicken
tight
-
tighten
tough
-
toughen
weak
-
weaken
white
-
whiten
wide
-
widen