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Adjective: efficient  i'fi-shunt
  1. Being effective without wasting time, effort or expense
    "an efficient production manager"; "efficient engines save gas"
  2. Able to accomplish a purpose; functioning effectively
    "an efficient secretary"; "the efficient cause of the revolution";
    - effective

See also: businesslike, competent, cost-effective, cost-efficient, economic, economical, effective, effectual, efficacious, expeditious, high-octane, high-test [US], streamlined

Antonym: inefficient

Encyclopedia: Efficient