Artificial intelligent assistant

sighless

sighless, a. rare.
  (ˈsaɪlɪs)
  [f. sigh n. + -less.]
  Giving or sending forth no sigh.

c 1835 Mrs. Browning Felicia Hemans i, O'er the sighless songless lips, the wail and music wedding. 1838Seraphim Epil. iii, So soon to lie Sighless, because then breathless, in the tomb.

Oxford English Dictionary

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