Contentiousness (n.) is for enemies at odds; friends debate each other on good terms.
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Contentiousness (n.) stitches up everyone's mouth, its own included: denying that anything is beautiful or good or different, it silences the speaker along with the opponent.
Contentiousness (n.) in argument has an old trouble no verbal precision can cure: it falls down itself in the act of knocking others down.
Contentiousness (n.) is the youthful mania for rolling every statement up into one and unrolling it into many, confounding oneself first and then everyone in earshot.
Contentiousness (n.) is caring only that listeners accept your position; the philosopher wants instead to be thoroughly convinced himself.