na-adjective
bored; uninterested; looking bored
Describes someone's appearance or manner as seeming bored or uninterested. Often used as a na-adjective modifying a noun or with そうだ.
See also: 詰まらなさそう
彼はつまらなそうな顔で窓の外を見ていた。
He was looking out the window with a bored expression.
その映画はつまらなそうだったので、見なかった。
That movie looked boring, so I didn't watch it.