The definition for placebo is "An inactive substance used in medical testing." Used in a sentence: Tom, who had taken the placebo, found that his allergy symptoms did not go away. The definition for lenient is "mild or tolerant.", the definition for naive is "Lacking worldy wisdom.", and the definition for insinuate is "To suggest indirectly."

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 derelict is "abandoned.", the definition for archaic is "Characteristic of an earlier time.", and the definition for turpitude is "Essential baseness, depravity."

The definition for augment is "To make greater." Used in a sentence: Wanda read the dictionary every night to augment her vocabulary. The definition for foil is "one that enhances or underscores by contrast.", the definition for stealth is "The act of moving secretly or unnoticed.", and the definition for insinuate is "To suggest indirectly."

The definition for extant is "Currently existing." Used in a sentence: Some consider Clint Eastwood the greatest extant American director. The definition for futile is "without purpose, completely ineffective.", the definition for lurid is "Causing horror, shocking.", and the definition for combustion is "Act of burning."

The definition for onset is "Beginning." Used in a sentence: Crocuses bloom at the onset of spring, sometimes even before the snow melts. The definition for rehash is "to discuss again.", the definition for recrimination is "A retaliatory accusation.", and the definition for intricate is "Having complex and interrelated parts."