12-Letter Words Matching I_______U___

There are 23 12-letter words that match I_______U___. 12 are common words, such as IMPERVIOUSLY and INCERTITUDES. A rarer one is INTERWROUGHT. In this set, N is the most frequent open letter (21 words). 3 words contain a doubled letter.

Full list 23

imperviouslyincertitudesincestuouslyindecorouslyindissolubleindissolublyinfectiouslyingloriouslyingratitudesiniquitouslyinterlocutorinvestituresidolatrouslyincautiouslyinconsequentindigenouslyinfundibulumincurvaturesinfundibularinsightfullyinterfacultyinterlobularinterwrought

About this list

Words
23 (12 common words)
Common example
imperviously
Rare example
interwrought
Doubled letters
3
Ending in S
4
Most frequent letter
N (21)

Questions

How many 12-letter words matching i_______u___ are there?

23. 12 of them are common words.

What is a common example?

IMPERVIOUSLY is among the common words in this set.