1. without logical or meaningful connection; disjointed; rambling: an incoherent sentence.
  2. characterized by such thought or language, as a person: incoherent with rage.
  3. not coherent or cohering: an incoherent mixture.
  4. lacking physical cohesion; loose: incoherent dust.
  5. lacking unity or harmony of elements: an incoherent public.
  6. lacking congruity of parts; uncoordinated.
  7. different or incompatible by nature, as things.
  8. Physics. (of a wave) having a low degree of coherence.Compare coherent(def 4).


  1. lacking in clarity or organization; disordered
  2. unable to express oneself clearly; inarticulate
  3. physics (of two or more waves) having the same frequency but not the same phaseincoherent light

1620s, from in- (1) “not, opposite of” + coherent. Related: Incoherently.

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