The quality of being gradual; the state or characteristic of happening slowly and by degrees rather than suddenly.
From 'gradual' plus suffix '-ness' (state or quality). This is a simple but emphatic way to describe the property of slow, step-by-step change.
The gradualness of climate change made it hard to convince people for decades—our brains evolved to notice sudden dangers, not slow trends, so we're naturally bad at responding to gradual threats!
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