What was the original word used in the expression "studiously avoiding their glance"

Formerly, there was a distinct word that sounded a lot like studiously and meant to pretend not to do or notice something. It hasn't been used much in a long time, but I remember John Fowles used it and so did Al Stewart, though I can't nail down either occurrence. The word ended up an orphan with it's only use being "X avoiding their glance", until it was superseded entirely by "studiously" which makes no sense literally. I thought it was something like strudiviously but I haven't ever found anything on the web. I do recall a discussion of this, possibly by William Safire, but again, I can't locate the source online.

Here are a number of suggestions, some of which may be completely off base:

• surreptitiously

• assiduously

• deliberately

• obviously

• successfully or unsuccessfully

• overtly or covertly

• painfully

• blithely

• indifferently

• defiantly

• cruelly

• unsympathetically

• nervously

• haughtily

• stealthily

• premeditatedly

• consciously

Had enough? I kinda like assiduously.