The definition for combustion is "Act of burning." Used in a sentence: Campers must use fire with great caution to prevent combustion of the parched brush. The definition for raucous is "noisy, rowdy.", the definition for untenable is "Not able to be defended.", and the definition for fidelity is "State of being faithful."

The definition for oblivious is "Lacking awareness." Used in a sentence: Love–struck Charlie was oblivious to everyone but the object of his affection. The definition for inauspicious is "not favorable.", the definition for compulsion is "An irresistible impulse.", and the definition for punctual is "On time."

The definition for incumbent is "Necessary as a duty or responsibility." Used in a sentence: It was incumbent on Jack to attend his father's retirement party. The definition for melee is "a tumultuous fight among several people.", the definition for scapegoat is "Someone who bears the blame for others.", and the definition for implausible is "Unbelievable."

The definition for drub is "To defeat decisively." Used in a sentence: The powerful young boxer drubbed the longtime champion. The definition for insinuate is "to suggest indirectly.", the definition for corrective is "Intended to correct.", and the definition for discern is "To recognize as separate as distinct."

The definition for impenitent is "Lacking remorse." Used in a sentence: The impenitent criminal received a harsh penalty, but his remorseful accomplice was released. The definition for revive is "to bring back to life.", the definition for gargantuan is "Gigantic.", and the definition for iridescent is "Having a lustrous or attractivve quality."