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.

Constituting a very large, indefinite number; innumerable: “The myriadsnowflakes in the winter.”

1. Expressing rigid opinions; Prone to expressing strongly held beliefs and opinions. “A dogmatic speech.” 2. Asserting opinions in a doctrinaire or arrogant manner; opinionated.

Characterized by or subject to whim; impulsive and unpredictable. “He’s such a capricious boss I never know how he’ll react.”

1. Seeking and enjoying the company of others; sociable. “She is a gregarious, outgoing person.”

1. Instinctual: proceeding from instinct rather than from reasoned thinking or intellect. “A visceral business decision.” 2. Emotional: characterized by or showing crude or elemental emotions.