unadulterated

US /ˌʌn.əˈdʌl.ə.reɪ.t̬ɪd/
UK /ˌʌn.əˈdʌl.ə.reɪ.t̬ɪd/
1.

không pha trộn

not spoiled or made weaker by the addition of other substances; pure:

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People injecting drugs can never be sure that they're using unadulterated substances.