12-Letter Words Matching U_________U_

There are 16 12-letter words that match U_________U_. 3 are common words, such as UNPROPITIOUS and UNSCRUPULOUS. A rarer one is UNPROSPEROUS. In this set, N is the most frequent open letter (14 words). 3 words contain a doubled letter.

Full list 16

unpropitiousunscrupulousunsuccessfulunchivalrousunnilpentiumunnilquadiumunremorsefulunrespectfulunsuspiciousunthoughtfulultracarefulultraseriousuncensoriousuncourageousunfastidiousunprosperous

About this list

Words
16 (3 common words)
Common example
unpropitious
Rare example
unprosperous
Doubled letters
3
Ending in S
9
Most frequent letter
N (14)

Questions

How many 12-letter words matching u_________u_ are there?

16. 3 of them are common words.

What is a common example?

UNPROPITIOUS is among the common words in this set.