Adjective

(en adjective)

Acting as an instrument; serving as a means; contributing to promote; conductive; helpful; serviceable; essential or central.

He was instrumental in conducting the business.

* (rfdate), (William Shakespeare), (Hamlet), I,ii

The head is not more native to the heart, The hand more instrumental to the mouth —

(music) Pertaining to, made by, or prepared for, an instrument, especially a musical instrument.

instrumental music

* (rfdate) (Thomas Babington Macaulay)

He defended the use of instrumental music in public worship.

* (rfdate) (John Dryden)

* Sweet voices mix'd with instrumental sounds.

(grammar) Applied to a case expressing means or agency, generally indicated in English by by'' or ''with with the objective.

the instrumental case

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.