homely
plain
subfusc
unappealing
uninviting
unprepossessing
unpresentable
beautiless
bitter
blemished
blotted
cacophonic
cacophonous
defaced
disagreeable
disfigured
dislikable
displeasing
distasteful
dysphemistic
dysphemized
inelegant
marred
short on looks
sour
spoiled
thankless
uglified
ugly
ugly as hell
ugly as sin
unaesthetic
unalluring
unappetizing
unbeauteous
unbeautiful
uncomely
undelectable
undelicious
undesirable
unengaging
unenjoyable
unhandsome
unlikable
unlovely
unpalatable
unpleasant
unpleasing
unpretty
unsavory
unsightly
untasteful
unwelcome
Embarrass
barren
disappoint
disconcert
inappropriate
inconvenient
ineffective
insecure
objectionable
repugnant
repulsive
uninteresting
unpopular
unremarkable
unsatisfactory
unsuitable
vulnerable
active
attractive
hyperactive
inactive
interactive
overactive
photorefractive
proactive
radioactive
reactive
refractive
retroactive