15-Letter Words Matching __I__________L_

There are 13 15-letter words that match __I__________L_. 3 are common words, such as PHILOSOPHICALLY and UNIMAGINATIVELY. A rarer one is QUINCENTENNIALS. In this set, N is the most frequent open letter (12 words). 9 words contain a doubled letter.

Full list 13

philosophicallyunimaginativelyunintentionallyunimplementableuninformativelyunintelligentlyuninterpretableuninterruptedlyuninterruptibleanisotropicallyepiphenomenallyorientationallyquincentennials

About this list

Words
13 (3 common words)
Common example
philosophically
Rare example
quincentennials
Doubled letters
9
Ending in S
1
Most frequent letter
N (12)

Questions

How many 15-letter words matching __i__________l_ are there?

13. 3 of them are common words.

What is a common example?

PHILOSOPHICALLY is among the common words in this set.