空しい

Etymology
From. Appears in the earliest texts of the 700s, including the ' and the '. Ultimately from.

Analyzable as + adjective-forming suffix.

Adjective

 * 1) empty, hollow, void
 * 2) groundless, baseless, false
 * 3) uncertain, unreliable, vain, futile
 * 4) dead, lifeless
 * 5) unthinking (about someone), unattached (to someone)
 * 1) dead, lifeless
 * 2) unthinking (about someone), unattached (to someone)
 * 1) unthinking (about someone), unattached (to someone)