The definition for foil is "One that enhances or underscores by contrast." Used in a sentence: The sweet cookie was a perfect foil to the sour lemon sorbet. The definition for unscrupulous is "lacking principles.", the definition for servile is "Fearfully submissive.", and the definition for fidelity is "State of being faithful."

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 incongruous is "not harmonious, incompatible.", the definition for euphoria is "Feeling of great happiness.", and the definition for gruff is "Rough or stern in manner or speech."

The definition for commemorate is "To mark by a ceremony." Used in a sentence: Each year, the Franklins commemorate their anniversary by visiting the site of their first date. The definition for prune is "to reduce by removing excess.", the definition for flagrant is "Noticeably offensive.", and the definition for gravity is "Importance, significance."

The definition for repentant is "Feeling regret." Used in a sentence: The repentant Dana admitted to cheating on the test. The definition for pretentious is "making unjustified claims.", the definition for compulsion is "An irresistible impulse.", and the definition for pretense is "False intention or purpose."

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 pretense is "false intention or purpose.", the definition for heed is "To pay attention to.", and the definition for trove is "Valuable collection."