Insatiable
(adj.) so great or demanding as not to be satisfied.
Invidious
(adj.) offensive, hateful; tending to cause bitterness and resentment.
Substantiate
(v.) to establish by evidence, prove; to give concrete or substantial form to.
Intermittent
(adj.) stopping and beginning again, sporadic.
Motif
(n.) a principal idea, feature, theme, or element; a repeated or dominant figure in a design or work.
Derelict
(adj.) left abandoned; neglectful of duty.
Diatribe
(n.) a bitter and prolonged verbal attack.
Complicit
(adj.) involved in wrongdoing; being an accomplice.
Taciturn
(adj.) habitually silent or quiet, inclined to talk very little.
Tenable
(adj.) capable of being held or defended.