Where does “unadvertisable” come from?

unadvertisable (English) comes from English advertisable, from English advertise, from Middle English advertisen, from Middle French advertir, from Old French avertir, from Latin advertō, from Latin ad-, from Latin īn- — in.

unadvertisable (English): That cannot be advertised

Definitions

That cannot be advertised

Ancestry of “unadvertisable”, step by step

unadvertisable traces back through two separate lines of ancestry.

via English advertisable

Step	Language	Word	Meaning
1	English	advertisable	Suitable for being advertised
2	English	advertise	To give (especially public) notice of (something); to announce publicly
3	Middle English	advertisen	To pay attention
4	Middle French	advertir	to warn
5	Old French	avertir	to inform; to notify; to notice; to remark
6	Latin	advertō	to turn to or towards
7	Latin	ad-	to; usually prefixed to verbs, in which cases it...
8	Latin	īn-	un-, non-, not
9	Latin	în	in, at, on, upon, from (space)
10	Latin	en	lookǃ beholdǃ; reallyǃ?; come onǃ
11	Proto-Italic	en	in
12	Proto-Indo-European	h₁én	in

via English un

Step	Language	Word	Meaning
1	English	un	One

Every word from Proto-Indo-European h₁én →Every word from Latin īn- →Every word from Latin ad- →