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 recrimination is "a retaliatory accusation.", the definition for induce is "To influence or cause.", and the definition for incongruous is "Not harmonious, incompatible."

The definition for avian is "Relating to birds." Used in a sentence: The old man affectionately referred to pigeons as his "avian friends." The definition for melodious is "having a pleasing melody.", the definition for insinuate is "To suggest indirectly.", and the definition for ramble is "To wander, physically or in language."

The definition for opportune is "Suitable or convenient." Used in a sentence: Quan stepped onto the platform at the most opportune time, just as the train pulled in. The definition for aerate is "to supply with air.", the definition for curtail is "To make less.", and the definition for revive is "To bring back to life."

The definition for facade is "false or superficial appearance." Used in a sentence: Emily's smile is just a facade masking her broken heart. The definition for curtail is "to make less.", the definition for disconcert is "To throw into confusion.", and the definition for redouble is "To make twice as great."

The definition for illuminate is "To make clear." Used in a sentence: Her excellent lecture illuminated the complicated subject of nuclear physics. The definition for gravity is "importance, significance.", the definition for curtail is "To make less.", and the definition for parity is "Equality."