sirenical

From siren +‎ -ical.

sirenical (comparative more sirenical, superlative most sirenical)

1. (now rare) Like, or appropriate to, a siren, i.e. deceptive;fascinating.

   Synonym: sirenic

   • c. 1603 (date written), Iohn Marston, The Malcontent, London: […] V[alentine] S[immes] for William Aspley, […], published 1604, →OCLC, Act III, scene iv:

     [H]ere's a couple of Syrenicall raſcals ſhall inchaunt yee: What ſhall they ſinge my good Lorde?

• “sirenical”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.