incoherent

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in·co·her·ent

(in'kō-hēr'ent),
Not coherent; disjointed; confused; denoting a lack of connectedness or organization of parts during verbal expression.
[L. in- neg. + co-haereo, pp. -haesus, to cling together, fr. haereo, to stick]

incoherent

[in′kōhir′ənt]
Etymology: L, in, not, cohaere, to hold together
1 disordered; without logical connection; disjointed; lacking orderly continuity or relevance.
2 unable to express one's thoughts or ideas in an orderly, intelligible manner, usually as a result of emotional stress.

incoherent

(ĭn″kō-hē′rĕnt)
Not coherent or understandable.

coherent sources 

If light beams from two independent sources reach the same point in space, there is no fixed relationship between the phases of the two light beams and they will not combine to form interference effects. Such light waves are called incoherent. If, on the other hand, the two light beams are superimposed after reaching the same point by different paths but are both radiated from one point of a source, interference effects will be seen because the phase difference in the two beams is constant. The two virtual sources from which these two beams are apparently coming are called coherent sources and any rays in which there is a constant phase difference are called coherent rays. Prior to the advent of the laser, the only way in which one could obtain coherent rays was by dividing the light coming from a point source into two parts. See Young's experiment; holography; clinical maxwellian view system; optical coherence tomography.
References in classic literature ?
The trapper drew slowly aside, as if satisfied with the somewhat incoherent reason Ellen had given why he should retire.
That the people and the States should, for a sufficient period of time, elect an uninterupted succession of men ready to betray both; that the traitors should, throughout this period, uniformly and systematically pursue some fixed plan for the extension of the military establishment; that the governments and the people of the States should silently and patiently behold the gathering storm, and continue to supply the materials, until it should be prepared to burst on their own heads, must appear to every one more like the incoherent dreams of a delirious jealousy, or the misjudged exaggerations of a counterfeit zeal, than like the sober apprehensions of genuine patriotism.
Valentine in the extremity of her terror joined her hands, -- for she felt that the moment had arrived to ask for courage, -- and began to pray, and while uttering little more than incoherent words, she forgot that her white shoulders had no other covering than her long hair, and that the pulsations of her heart could he seen through the lace of her nightdress.