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 naive is "lacking worldy wisdom.", the definition for diffident is "Lacking self–confidence.", and the definition for perception is "Capacity for seeing or understanding."

The definition for diffident is "Lacking self–confidence." Used in a sentence: The diffident student never raised her hand in class, even when she knew the answer. The definition for gruff is "rough or stern in manner or speech.", the definition for demean is "To lower status.", and the definition for immoderate is "Beyond usual or proper limits."

The definition for liability is "A person or thing whose presence or behavior is likely to cause embarrassment or put one at a disadvantage." Used in a sentence: Kevin's growing fatigue was a liability as he attempted to climb the steep hill. The definition for dubious is "questionable.", the definition for methodical is "Performed in an orderly manner.", and the definition for embellish is "To decorate."

The definition for prudent is "Marked by wisdom, shrewd." Used in a sentence: Manny was happy she followed Greg's prudent advice to study, as the test was difficult. The definition for straddle is "to favor opposing sides.", the definition for flaw is "An imperfection.", and the definition for corroborate is "To support with evidence."

The definition for recrimination is "A retaliatory accusation." Used in a sentence: Frank, who was wounded by Sally's remark, made a bitter recrimination. The definition for catastrophic is "relating to extreme misfortune.", the definition for adversary is "One who opposes or resists.", and the definition for gargantuan is "Gigantic."