O
obduracy of mind [obduracy = intractable; hardened]
object of contempt
obligation of loyalty
obliquity of vision [obliquity = mental deviation or aberration]
obscurity of twilight
ocean of eloquence
omission of fact
onrush of life
onsets of temptation
openness of mind
opulence of detail
orgy of lying
ornaments of eloquence
outbreak of hostilities
outburst of tears
outflow of sympathy
outposts of morality
overflow of vitality