13-Letter Words Matching __D_____L____

There are 12 13-letter words that match __D_____L____. 3 are common words, such as UNDEREMPLOYED and UNDERWHELMING. A rarer one is UNDUTIFULNESS. In this set, I is the most frequent open letter (11 words). 2 words contain a doubled letter.

Full list 12

underemployedunderwhelmingundisciplinedindisciplinesunderinflatedunderutilizedhydrocolloidsindisciplinedradiobiologicradionuclidesunderutilizesundutifulness

About this list

Words
12 (3 common words)
Common example
underemployed
Rare example
undutifulness
Doubled letters
2
Ending in S
5
Most frequent letter
I (11)

Questions

How many 13-letter words matching __d_____l____ are there?

12. 3 of them are common words.

What is a common example?

UNDEREMPLOYED is among the common words in this set.