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 redouble is "to make twice as great.", the definition for buffoonery is "Foolish behavior.", and the definition for iridescent is "Having a lustrous or attractivve quality."

The definition for curtail is "To make less." Used in a sentence: Doreen decided to curtail her spending after she bounced a check. The definition for beneficial is "helpful.", the definition for mundane is "Practical, ordinary.", and the definition for frugal is "Thrifty, cheap."

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 procrastinate is "to put off intentionally.", the definition for nurture is "To further the development of.", and the definition for sociable is "Inclined to seek companionship."

The definition for prune is "To reduce by removing excess." Used in a sentence: The candidate pruned his speech so he would not exceed the time limit. The definition for recrimination is "a retaliatory accusation.", the definition for catastrophic is "Relating to extreme misfortune.", and the definition for combustion is "Act of burning."

The definition for comprehensible is "Understandable." Used in a sentence: Shannon spoke slowly so her directions would be comprehensible to her foreign visitor. The definition for rail is "to scold in harsh language.", the definition for combustion is "Act of burning.", and the definition for cunning is "Showing clever insight."