The definition for buffer is "Protective barrier." Used in a sentence: The dense trees acted as a buffer against the heavy rain. The definition for incisive is "impressively direct and decisive.", the definition for incumbent is "Necessary as a duty or responsibility.", and the definition for retroactive is "effective as of a prior time or condition."

The definition for gruff is "Rough or stern in manner or speech." Used in a sentence: Heidi's grandfather was gruff, barking stern orders and hardly smiling. The definition for inflammatory is "tending to excite anger.", the definition for abate is "Become less in amount or intensity.", and the definition for prominence is "Importance."

The definition for dubious is "Questionable." Used in a sentence: Karl found Kevin's claim that he was sick dubious, as he had just seen him playing football. The definition for indecorous is "in bad taste.", the definition for pantomime is "Telling a story through gestures.", and the definition for accessible is "Easy to reach or to approach."

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 flaw is "an imperfection.", the definition for regurgitate is "To pour out or throw back.", and the definition for stern is "Harsh, severe."

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 foil is "one that enhances or underscores by contrast.", the definition for aesthete is "Person having or affecting sensitivity to beauty.", and the definition for melee is "A tumultuous fight among several people."