No, it is not. It can be a noun (e.g. noticing problems), or a verb form.
It is the present participle of the verb 'to notice' but is not amenable to being used as an adjective.
He was noticing that the same car had been following him all day.
It's noticing me noticing you. I think it's by akon. Dangerous?
You can't get someone fat without them noticing. They'll be getting fatter!
Yes. That is the correct spelling of noticing (seeing, noting). It is the present participle of the verb to notice.
Yes because u could wee/pee a little without noticing!
Yes, the word 'observant' is a noun, an obsolete word for a member of a religious group or order that follows strict religious laws. The word 'observant' is an adjective, a word that describes a noun as noticing everything that happens; quick to notice.
George would nap under his desk without anyone at work noticing.
Why, yes, it is. Thank you for noticing that.
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By noticing white flakes on your scalp.
Quantitave Observation.