Definition of "bland"

First and foremost, alternative country artists generally claim to reject mainstream country music as musically indistinguishable from bland pop music, as lyrically superficial, and as having no artistic merit […]

2012, John Shepherd, David Horn, Continuum Encyclopedia of Popular Music of the World

He's reading Balzac and knocking back Prozac / It's a helping hand that makes you feel wonderfully bland

1996, “Country House”, in The Great Escape, performed by Blur

Where didst thou find, young Bard, thy sounding lyre? / Where the bland accent, and the tender tone?

1818, John Keats, Sonnet

“A tight little craft,” was Austin’s invariable comment on the matron; […]. ¶ Near her wandered her husband, orientally bland, invariably affable, and from time to time squinting sideways, as usual, in the ever-renewed expectation that he might catch a glimpse of his stiff, retroussé moustache.

1907 August, Robert W[illiam] Chambers, chapter IX, in The Younger Set, New York, N.Y.: D. Appleton & Company