What does "inane" mean?

Inane: Without contents; empty; void of sense or intelligence; purposeless; pointless; characterless; useless. "Vague and inane instincts." I. Taylor. -- In*ane"ly, adv.

Additional senses

  1. 2.That which is void or empty. [R.] The undistinguishable inane of infinite space. Locke.

Sources