strung out - definition and synonyms

adjective informal 

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/ˌstrʌŋ ˈaʊt/
  1. 1
    under the influence of illegal drugs
    strung out on:

    He was clearly strung out on heroin.

    1. a.
      unable to act normally because you have used illegal drugs for a long time
  2. 2
    very tired, nervous, and worried