(a.) Empty; unfilled; void; vacant\.

airy asinine awkward bare barren bland blank blankminded bleached callow calm catchpenny characterless clear devoid dumb empty empty-headed empty-minded empty-pated empty-skulled existless fatuous featureless flimsy foolish fribble fribbling frivolous frothy futile gauche green groping hollow idle ignorant inane incogitant inexperienced innocent insipid jejune know-nothing lacking light minus missing naive negative nescient nirvanic nonexistent nugacious nugatory null null and void oblivious otiose passive quietistic rattlebrained rattleheaded raw relaxed scatterbrained shallow silly simple slender slight strange to superficial tentative thoughtfree thoughtless tranquil trifling trite trivial unacquainted unapprized uncomprehending unconversant unenlightened unexisting unfamiliar unideaed unilluminated uninformed uninitiated unintellectual unintelligent unknowing unoccupied unposted unreasoning unrelieved unripe unsure unthinking unversed vacant vain vapid void white windy with nothing inside without being without content