Febrile

Pronunciation: FEB-ruhl; FEE-bruhl/bryl.
Adjective: Of or relating to or characterized by fever; feverish; hyperpyrexia(medical terminology)

Usage: My niece was taken to the doctor, and the doctor remarked about she having febrile fits; Tom called in sick, saying he was febrile.

Factious

Pronunciation: FAK-shuhs
Adjective: Given to faction; addicted to form parties and raise dissensions; turbulent; pertaining to faction.

Usage: Tom made a factious(quarrelsome) comment about his sister, to her boyfriend.

Antonyms: agreeing, cooperating.