De or het feedbackbriefje?

The correct Dutch article is:

het feedbackbriefje

Rule Diminutives (-je, -tje, -pje): always het. See the rule

This word is not in the word lists we use to double-check answers.

How to use feedbackbriefje

the feedbackbriefjehet feedbackbriefje
this feedbackbriefjedit feedbackbriefje
that feedbackbriefjedat feedbackbriefje
our feedbackbriefjeons feedbackbriefje
your feedbackbriefjejouw feedbackbriefje
every feedbackbriefjeelk feedbackbriefje
which feedbackbriefje?welk feedbackbriefje?
a big feedbackbriefje / the big feedbackbriefjeeen groot feedbackbriefje, het grote feedbackbriefje