Here are some options:
* "Nirvaaram" (നിർവാരം): This is the most common and literal translation for "boring."
* "Aasakthi illa" (ആസക്തി ഇല്ല): This means "no interest" and can be used to describe something that is boring.
* "Kudiyattam illa" (കുടിയാട്ടം ഇല്ല): This means "no excitement" and can be used to describe something that is dull or monotonous.
* "Upamaayamaaya" (ഉപമായാമായ): This means "ordinary" or "commonplace" and can be used to describe something that is not interesting.
* "Ubhayaram" (ഉഭയരം): This is a more informal way to say "boring" and can be used with friends or family.
The best option for you will depend on the specific situation.