discordant
Meaning: not agreeing, not in harmony with
Usage: The girls’ sobs were a discordant sound amid the general laughter that filled the restaurant.
disparate
Meaning: sharply differing, containing sharply contrasting elements
Usage: Having widely varying interests, the students had disparate responses toward the novel.
divisive
Meaning: causing dissent, discord
Usage: Her divisive tactics turned her two friends against each other.
dissonance
Meaning: lack of harmony or consistency
Usage: Though the president of the company often spoke of the company as reliant solely upon its workers, her decision to increase her own salary rather than reward her employees revealed a striking dissonance between her alleged beliefs and her actions.
chaos
Meaning: absolute disorder
Usage: Mr. Thornton’s sudden departure for the lavatory plunged his classroom into chaos.