What is "inthralling"

Inthrall \In*thrall"\, v. t. [imp. & p. p. Inthralled; p. pr. & vb. n. Inthralling.] [Cf. Enthrall.] [Written also inthral, enthral, and enthrall.] To reduce to bondage or servitude; to make a thrall, slave, vassal, or captive of; to enslave.

She soothes, but never can inthrall my mind.
--Prior.

vb. (present participle of inthrall English)