effective

adjectives

producing or capable of producing an intended result or having a striking effect
"an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation"-LewisMumford; "effective teaching methods"; "effective steps toward peace"; "made an effective entrance"; "his complaint proved to be effectual in bringing action"; "an efficacious law"
effective, effectual, efficacious
is derived from
effect
is derived from
effectiveness
is derived from
effectivity
antonym
ineffective
able to accomplish a purpose; functioning effectively
"people who will do nothing unless they get something out of it for themselves are often highly effective persons..."-G.B.Shaw; "effective personnel"; "an efficient secretary"; "the efficient cause of the revolution"
effective, efficient
is derived from
effect
is derived from
effectiveness
is derived from
effectivity
works well as a means or remedy
"an effective reprimand"; "a lotion that is effective in cases of prickly heat"
effective
is derived from
effectiveness
is similar to
marked by qualities giving the power to produce an intended effect
"written propaganda is less efficacious than the habits and prejudices...of the readers"-Aldous Huxley; "the medicine is efficacious in stopping a cough"
efficacious
exerting force or influence
"the law is effective immediately"; "a warranty good for two years"; "the law is already in effect (or in force)"
effective, good, in effect, in force
existing in fact; not theoretical; real
"a decline in the effective demand"; "confused increased equipment and expenditure with the quantity of effective work done"
effective
is similar to
presently existing in fact and not merely potential or possible
"the predicted temperature and the actual temperature were markedly different"; "actual and imagined conditions"
actual, existent
ready for service
"the fort was held by about 100 effective soldiers"
effective
is similar to
(military) of or intended for or involved in military operations
operational
domain category
the military forces of a nation
"their military is the largest in the region"; "the military machine is the same one we faced in 1991 but now it is weaker"
armed forces, armed services, military, military machine, war machine