Hard-hearted; stubborn – an obdurate, unrepentant criminal.
(noun: OBLIVION): Forgetful; absent-minded – walking oblivious of his surroundings.
A persistent feeling, idea, activity, etc., which dominates a person; the state of being exclusively preoccupied by a fixed idea – Now that he has learned bowling, it has become his obsession.
No longer in use – an obsolete word, not even included by most dictionaries.
(verb: OBTRUDE): Thrusting oneself or itself into undue prominence – made himself obnoxiously obtrusive.
To prevent, dispose of, or make unnecessary by appropriate actions – an act which obviated all objections.
All-powerful – an omnipotent despot.
Burden; duty; obligation – bore the onus of his difficult office creditably.
Apparent; pretended – his ostensible, though not actual, purpose.
To banish; to exclude from public favor or privileges – a former premier ostracized by popular vote.