15-Letter Words Matching U____I_________

There are 13 15-letter words that match U____I_________. 2 are common words, such as UNFAMILIARITIES and UNRELIABILITIES. A rarer one is UNSERIOUSNESSES. In this set, N is the most frequent open letter (13 words). 6 words contain a doubled letter.

Full list 13

unfamiliaritiesunreliabilitiesubiquitarianismunderinvestmentunequivocalnessunsociabilitiesunanticipatedlyunderinflationsundesirablenessundutifulnessesuninhibitednessunmitigatednessunseriousnesses

About this list

Words
13 (2 common words)
Common example
unfamiliarities
Rare example
unseriousnesses
Doubled letters
6
Ending in S
10
Most frequent letter
N (13)

Questions

How many 15-letter words matching u____i_________ are there?

13. 2 of them are common words.

What is a common example?

UNFAMILIARITIES is among the common words in this set.