YOU SAID:

Your mother is so obtuse

INTO JAPANESE

あなたの母親はとても鈍い

BACK INTO ENGLISH

Your mother is so dull

INTO JAPANESE

あなたの母親はとてもつまらない

BACK INTO ENGLISH

Your mother is so boring

INTO JAPANESE

あなたの母親はとても退屈です

BACK INTO ENGLISH

Your mother is so boring