Gerundial noun meaning 'the act or process of perturbing'; usually uncountable.
Definitions
The act or process of causing disturbance or anxiety; the action of perturbing. The perturbing of the satellite's orbit required immediate correction.
perturbgerund / present participle Used attributively and predicatively: "a perturbing idea", "The news was perturbing."
Definitions
Causing worry or unease; disturbing. The most perturbing aspect of the report was the lack of reliable data.