immune
insensitive
lifelike
natural
superior
unimpressed
uninfluenced
unmannered
unselfconscious
unstilted
unswayed
untouched
Attic
Bohemian
Ciceronian
Spartan
adamant
adamantine
aesthetic
affable
arcadian
artistic
artless
ascetic
austere
authentic
bald
bare
bona fide
bucolic
candid
card-carrying
cast-iron
casual
chaste
choice
classic
clear
comfortable in one's own skin
common
commonplace
cordial
degage
dinkum
direct
dour
dry
dull
easy
easygoing
elegant
excellent
familiar
finished
firm
flinty
folksy
following the letter
frank
free and easy
genuine
childlike
disinterested
genial
heartfelt
hearty
ingenuous
manly
self-possessed
serene
sincere
spontaneous
affected
connected
corrected
defected
deflected
dejected
detected
directed
disaffected
disconnected
disrespected
effected
ejected
elected
erected
expected
infected
injected
inspected
interconnected
interjected
intersected
misdirected
neglected
protected
recollected
reconnected
redirected
reelected
reflected
rejected
respected
resurrected
selected
subjected
suspected
uncollected
unconnected
uncorrected
undetected
unelected
unexpected
uninfected
unprotected
unsuspected