But ya'll are mistaking sesquidpedlianism (use of words a foot-and-a-half-long)for circumlocution (tactful or duplicitous avoiding of the straightforward).

Circumlocution would be saying, "The humidity in the house is variable. I believe your instruments have shifted while in play." Instead of "Would you please tune those damn things?"

I leave it to someone else to compose a sesquipedlian form.