intensity

intensity is on the Academic Word List.

Noun

(uncountable) The intensity of something is the amount of it in a given time or space.
These flowers suffer from high intensity of sunlight.

It all depends on the intensity of the work, not the amount.
(countable & uncountable) Intensity is a high level of power, strength, feeling, etc.
Marie understood the intensity of the old woman's hatred.

The intensity of the pain made him scream.

She spoke with a new intensity.