How should I use "passive-aggressive" as an adverb?

adverbs

Given that in other similar formations you only inflect the final word (nobody says something "selfly-conscious", for example), I think "passive-aggressively" is definitely the way to go.

Related

What preposition is used after "enthusiastic": "for" or "about"?
When do I use "me" and when "I"? [duplicate]
Information about "lookit"
What do you call a word whose meaning changes according to when or where it is said?
Do "good for you" and "I am happy for you" have a negative or positive connotation?
Are prepositions fixed for words?
A single vs a double consonant issue.
What is a name for a unit of measure and value
What does 'mothercanuckers' mean?
origin of phrase 'stone the crows'
Early use of the phrase "human being"
The extent to which something is required or mandatory [closed]