Words are words because people use them and other people understand them. If you use staticness and your audience understands what you mean: congratulations, you've created a word. May it have a long and healthy life.
@DanBron But just because we don't know a word, or can't immediately think of one, it is not a particularly good idea simply to invent one. The word the OP is looking for clearly seems to be stasis, as has been pointed out.
@Dan Bron What if 1% of OP's audience knows what OP means as he's used it in a previous chat and 20% guess correctly? Is it an 11%-word? What if 50% guess incorrectly? A -489%-word?
@EdwinAshworth At the same time but not in the same place. For example, did you know "શબ્દ" is a word? Probably not. Doesn't stop people on the other side of the world from using it all the time. Whether that's "useful" or not I'll leave to you.
No. By your definition, therefore, it's also not a word. There needs to be a stipulation about a measure of frequency of use involved in the definition of 'word'.
@EdwinAshworth I think you're starting to get it. To you, it's not a word. You don't know what it means. To someone else ... well, I think you can finish the thought.
@DanBron I don't think you are. We need a term to mean 'a unit of communication, spoken and written using conventional lettering, recognised as such by more than ... [say a couple of schoolboys inventing a secret code]. Many people use 'word' in that way.
@EdwinAshworth That's great for those people! And I'm also happy for the schoolboys, who were able to meet their ends without even knowing those people's opinions.
According to Dan Brown's definition of 'word', it doesn't seem to be a word for most of us since we don't know what it's supposed to mean. By the definition I would use, since I can't find it in any dictionary and no one here seems to know where to find a definition, I'd say that it's almost certainly not a word.
@EdwinAshworth Good job I explicitly and carefully told you what I mean by "word" when I first used it, then, eh? (Also, it's puzzling to read that you "don't understand" what staticness means, and then proceed to suggest synonyms. But then, I'm dumb, so I probably can't comprehend the philosophical and metaphysical tools you're employing.)
@Dan Brown What a pity you didn't indicate there that that was merely one possible definitionfor 'word' (and that others didn't accept it), but wrote as if that was the only acceptable one. Also, what a pity you didn't address the question of say just one person in an audience knowing what the speaker meant, perhaps because they were using the schoolboy language they'd invented years before.
@EdwinAshworth I'm happy to inform you that officially sanctioned dictionaries do have entries for "irony" and thus will enable you to understand what I mean when I label your most recent comment "painfully ironic". But just in case I've used any "non-standard" words or idioms that have rendered my previous sentence absolutely meaningless: you're saying I'm writing as if my view is the "only acceptable" one? Do you realize you're specifically struggling against what you view as a perspective you view as too accepting?
Odd that no one stopped to ask what the OP means. "Staticness" could be referring to the property of being motionless, to the tendency for an article to stick to your clothing, or for noise on a radio (and probably one or two others).
@Hot Licks Check my 6th comment above. I quite agree; DIY words-or-are-they? are often misinterpretable by a large minority, if not a large majority, of competent anglophones. That's why I think it's senseless to slap the term 'word' on a string just because half a dozen people guess right (or are in an inner circle).