abyss
articulate
bastion
cascade
contempt
contrite
covert
credulous
declivity
downward slope
decorum
demur
derision
discursive
dubious
ebullient
flourish
furtive
gravity
impervious
incantation
inscrutable
interminable
lament
to mourn or to express sorrow in a demonstrative manner
obscure
difficult to see, vague
obtuse
officious
opaque
parody
parry
pinnacle
tacit
vexation
discomfort or distress
vicissitude
vivid
vulnerable