This story is boring. 的同意句

isn`t interesting

is fastidium 无聊，烦人

is fiddlededee 无聊，没劲

is humdrum 乏味的

is tomfoolery
tomfoolery[简明英汉词典]
[ˈtɔmfuləri]
n. 愚蠢的举动,无聊

is tommyrot
tommyrot[简明英汉词典]
n. 瞎说,荒唐事,无聊

is bored
bored[简明英汉词典]
adj. 无聊的,无趣的,烦人的

is dull
dull[简明英汉词典]
[dʌl]
adj. 1 不鲜明的, 不清楚的, 晦暗的 2 迟钝的, 呆笨的 3 枯燥无味的 4 钝的, 不锋利的 5 萧条的, 清淡的

is pokey
pokey[简明英汉词典]
[ˈpəuki]
n. 〈美俚〉监狱
adj. 迟钝的,狭小的,破旧的,无趣的

This story is n't interesting.

is dull.
isn't interesting

is tiresome