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efficacy noun

  /ˈef.ɪ.kə.si/ , /ˈɛf.ɪ.kə.si/ , [ˈef.ɪ.kə.sɪi]
  • A degree of ability to produce a desired effect; effectiveness.
 efektywność, skuteczność

efficacious adjective

  /ˌef.əˈkæɪ.ʃəs/ , /ˌɛf.əˈkeɪ.ʃəs/ , /ˌɛf.ɪˈkeɪ.ʃəs/
  • (formal) Effective; possessing efficacy. [from 1520s]
 skuteczny
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