Friends, loan me your ears*. I see I misspelled "impressionable".
I guess it will come as no surprise to anyone that I have a cheap
email client with no spellchecker. The misspelling was inadvertent,
not ignorant (like "breech").
I should add that, yes, I do know that "breach" is a verb, but I
don't think that I would ever use it as a synonym for "break" in
the context we were discussing.