YOU SAID:

this app is quite intelligent, yet also quite dull.

INTO JAPANESE

このアプリは非常にインテリジェントですが、非常に鈍感です。

BACK INTO ENGLISH

The app is very intelligent but very dull.

INTO JAPANESE

アプリは非常にインテリジェントですが、非常に鈍いです。

BACK INTO ENGLISH

The app is very intelligent but very dull.