i-adjective
not interesting; boring; not fun
Kansai dialect adjective; the negative form of おもろい (interesting, funny). Used in casual speech to say something is dull or unamusing.
See also: おもろい
この映画、おもんないわ。
This movie is boring.
あの話、全然おもんなかったで。
That story wasn't interesting at all.