What's the adjective for externalising? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs externalize and externalise which may be used as adjectives within certain contexts.
“Insulating the external surface of the wall allows the temperature of the wall to increase, which will push the dew point towards the external surface.”
“It is only a matter of time before we come into a direct confrontation with it, either from within our own ranks or else as a threat from an external nation.”
“The use of internal consultants is not a passing fad, but nor will it replace the use of external consultants.”
“I think Noe's positive approach, especially as regards perceptual and related processes, has much to offer a good externalistic alternative.”
“Instead of becoming spiritually empowered, well-intentioned people continue to submit to externalistic religion.”
“It assumes an internalist epistemology, and the paradox it purportedly resolves is really the familiar clash of internalistic and externalistic epistemological intuitions.”