soporific
titivation
celerity
glabrous
quonset
churlish
piacular
belletristic
hateur
experiental
sedulous
loquacious
obsequious
skein
spume
rictus
epaulets
sommelier
priapic
slattern
numismatic
bier
cairn
reglet
vernal
putative
abstruse
fiduciary
trellis
peripatetic
piedmont
candor
aporia
corbel
tympan
coiffeur
mendicant
lapidary
sybarite
mordanr
apotheosis
prolix
prolapse
aleatoric
pinion
filigree
picayune
intestate
legatee
callipygian
anterior
lechery
loculus
splanchnic
mastic
febrile
limn
kerf
petulance
impropriety
quintessence
approbation
primrose
eclat (occasionally with accent on e)
zither
foliate
purlieu
somatic
intransigent
pertinacious
senescence
solecism
dysphemism
imperious
claustral
inimical
homiletic
reticulate
rondel
congenital
rutilant
squamulose
formicary (this is a very useful one)
wale (check the OED for a surfeit of useful and obsolete meanings)
surfeit
koan
alderman
propaedeutic
demimonde
sedge
paean
perspicuous
nonce
quidnunc
quincunx (great for Scrabble)
pericardium
perdition
perfidy
syllogism
cantle
fissiparous
collop
parsimonious
agnate
appelative
onomastic
ameliorate
lassitude
languor
ennui (if you've made it this far, you may have it)
eschar
fustian
magniloquent
palaver
perspicacious
sudatorium
vomitorium (interesting story)
esemplastic
argot
nadir
ersatz
aphorism
persiflage
rapport
bombastic
grandiloquent
aureate
dudgeon
betise (often with a circumflex on the e)