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 fraud is "trick.", the definition for civility is "Politeness.", and the definition for penurious is "Extrememly stingy."

The definition for periodic is "Occurring at regular intervals." Used in a sentence: The periodic innterruptions of the cuckoo clock prevented Li from concentrating. The definition for moderate is "tending toward the average.", the definition for aerate is "To supply with air.", and the definition for iridescent is "Having a lustrous or attractivve quality."

The definition for precept is "A general rule of action." Used in a sentence: All the students know Mrs. Brown's strict precept; no talking in class. The definition for equitable is "fair and equal.", the definition for absolve is "To forgive; to free from guilt.", and the definition for celebrated is "Widely known, respected."

The definition for catastrophic is "Relating to extreme misfortune." Used in a sentence: The effects of the massive hurricane were catastrophic. The definition for precept is "a general rule of action.", the definition for stern is "Harsh, severe.", and the definition for disconcert is "To throw into confusion."

The definition for implausible is "Unbelievable." Used in a sentence: Claudia's implausible excuse failed to convince her teacher. The definition for rancorous is "marked by deep ill–will.", the definition for incisive is "Impressively direct and decisive.", and the definition for repel is "To resist, reject."