YOU SAID:

finding stuff to be inadequate

INTO JAPANESE

不十分なものを見つける

BACK INTO ENGLISH

Find inadequate

INTO JAPANESE

不十分を見つける

BACK INTO ENGLISH

Find insufficient

INTO JAPANESE

不十分だと思う

BACK INTO ENGLISH

Think inadequate

INTO JAPANESE

不十分だと思う

BACK INTO ENGLISH

Think inadequate