adjectival

Neat obscure language thing: adjectival is the adjectival form of adjective.

"Petroleum-derived pitch is black in colour, hence the adjectival phrase, 'pitch-black'." That was the most interesting thing I found in this experiment.

After all, "stoliar" means "carpenter" and "ny" is an adjectival ending. He then goes on to argue that perhaps we should just read Dickens instead, since Dickens is, at some level, a "translation" of the Dosteovsky novel.

This latter usage is becoming increasingly common, to the point where the exclusively adjectival nature of "male" and "female" is being erased. Meanings and usage are pretty fluid over time.

Arab" is an ethnicity and an adjectival and demonym for a region. Arabic publications may or may not be Arab, and vice-versa.

TL;DR: 'looking' is definitely not a standard adjectival participle, since it can't function as an adjective on it's own, but instead needs to follow another adjective. Another excellent example of how words do not conform neatly to part of speech categories.

It's just a more spirited adjectival phrase. Seems to be that what's described -- fake servers to watch traffic, turning on a mic to listen, turning on a camera to watch -- are all in spirit extensions of an intel agent sitting at an AT&T operator's switch and plugging into a line to listen to a conversation.

Perhaps protocols/interfaces are like restrictive adjectival phrases, and metadata like non-restrictive. Just in case you don't know: Restrictive clauses limit the possible meaning of a preceding subject, whereas non-restrictive clauses tell something about a preceding subject, but do not limit its meaning.