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indiscernible

adjective
 
 
/ˌɪn.dɪˈsɜː.nɪ.bl̩/ US  /-ˈsɝː-/

Definition

impossible to see, see clearly, or understand: an indiscernible change/shape/reasonIndistinct and invisibleDifficult to understandComplicated and difficult to doPuzzle and confuse
(Definition of indiscernible adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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