Adjective

(en adjective)

Having the power to produce a required effect or effects.

The pill is an effective method of birth control.

Producing a decided or decisive effect.

The president delivered an effective speech!

* Jeremy Taylor

Whosoever is an effective , real cause of doing his neighbour wrong, is criminal.

Efficient, serviceable, or operative, available for useful work.

How long does it take to make a bunch of civilians an effective military force?

My effective income after taxes and child support is $500 a month.

The effective radiated power is determined by multiplying the transmitter power output with the antenna gain.

The effective voltage of an alternating current is 0.7 times its peak voltage.

Actually in effect.

The curfew is effective at midnight.

Having no negative coefficients.

Adjective

(er)

Untrue, not factual, factually incorrect.

*{{quote-book, year=1551, year_published=1888

, title= A New English Dictionary on Historical Principles: Founded Mainly on the Materials Collected by the Philological Society , section=Part 1, publisher=Clarendon Press, location=Oxford, editor= , volume=1, page=217 , passage=Also the rule of false position, with dyuers examples not onely vulgar, but some appertaynyng to the rule of Algeber.}}

Based on factually incorrect premises: false legislation

Spurious, artificial.

:

*

*:At her invitation he outlined for her the succeeding chapters with terse military accuracy?; and what she liked best and best understood was avoidance of that false modesty which condescends, turning technicality into pabulum.

(lb) Of a state in Boolean logic that indicates a negative result.

Uttering falsehood; dishonest or deceitful.

:

Not faithful or loyal, as to obligations, allegiance, vows, etc.; untrue; treacherous.

:

*(John Milton) (1608-1674)

*:I to myself was false , ere thou to me.

Not well founded; not firm or trustworthy; erroneous.

:

*(Edmund Spenser) (c.1552–1599)

*:whose false foundation waves have swept away

Not essential or permanent, as parts of a structure which are temporary or supplemental.

(lb) Out of tune.