a rumbling noise heard occasionally in some parts of the world, probably caused by seismic activity.

Productive: Producing abundant works or results. “A prolific artist.” “A prolific writer.”

Cheerfully optimistic, hopeful, or confident: “A sanguinedisposition;” “Sanguine expectations.”

1. Careless and irresponsible. “The kids were feckless during spring break.” 2. Lacking purpose or vitality; feeble or ineffective – unlikely to be successful. “It was a feckless attempt to make the company a success.”

1. Having no adverse effect; harmless. 2. Not likely to offend or provoke to strong emotion; insipid. “The innocuous looking e-mail actually contained a virus.”

 1. Independent in mind or judgment; self-directed. 2. Not controlled by others or by outside forces; independent: “The business divisions operate autonomously.”

1. Quick and changeable in temperament; volatile: “His mercurialtemperament made him difficult to work for.”

 Contemptuous in speech or behavior. 2. Unreasonably irritable or ill-tempered; rude. “She was fired over her petulant attitude to our customers.”

 A superabundance; an excessive amount or number: “Upon returning from the trip, she had a plethora of calls to make.”

1. Lasting for a markedly brief time: “The ephemeral nature of fashion trends.” 2. Living or lasting only for a day, as with certain plants or insects.