square
lame
noncomprehender
confuter
stranger
nonadherent
enfant terrible
frequent flyer
confounder
unsociable
Rip van Winkle
know-it-all
birdbrain
distruster
know-all
puzzlehead
secret squirrel
obsessor
bane of someone's life
merry andrew
bug
creep
goof
the lights are on, but nobody's home
clown
goofball
simpleton
buffoon
obscurantist
mismeeting
layperson
bane of someone's existence
perplexer
nuisance
experiencer
obfuscation
screwball
sphinx
interferer
noncooperator
alarmist
confusionist
mystification
lightning rod
misappropriator
pawn
happener
messer-upper
not know whether one is coming or going
vilipender
slut
nerd
every shut eye isn't asleep
panphobe
village idiot
wirepuller
cynic
analphabet
shrinking violet
unsentimentalist
suppressor
customer
magician
non-responder
misuser
man in the street
understander
distractee
worrier
shitmonger
suppresser
alienator
clutch one's pearls
perfectionist
intolerator
naysayer
shy person
disreputable
confronter
explainee
unpleasant person
badgerer
gloomy
disagreeable person
unemotional person
cuckoo
illiterate
nonacquaintance
beard
incomprehensiveness
mob
stoic
exclusionist
deviant
nonexpert
buttinsky
disrupter
heckler