13-Letter Words Matching __I____S_____

There are 18 13-letter words that match __I____S_____. 10 are common words, such as CHILDLESSNESS and FAITHLESSNESS. A rarer one is WHITEWASHINGS. In this set, E is the most frequent open letter (17 words). 13 words contain a doubled letter.

Full list 18

childlessnessfaithlessnessguilelessnesshairdressingsnoiselessnesspointlessnessquintessencesreimbursementshiftlessnessvoicelessnessspinelessnessunimpassionedwhithersoeverglioblastomasguiltlessnessreimpressionstritheisticalwhitewashings

About this list

Words
18 (10 common words)
Common example
childlessness
Rare example
whitewashings
Doubled letters
13
Ending in S
14
Most frequent letter
E (17)

Questions

How many 13-letter words matching __i____s_____ are there?

18. 10 of them are common words.

What is a common example?

CHILDLESSNESS is among the common words in this set.