/ˈplɪnθ.li/
adverb · etym: anglo-noemic · plinth (base, pedestal) + -ly
with the steady self-possession of something standing on its own base.
a kettle on a hob can be plinthly. a sentence can be plinthly. a stranger waiting on a platform, holding their bag without fidgeting, is plinthly. the word does not imply pride; it implies a sufficient relation to the ground.
in the lexicon, plinthly is a near-relation of idolic but more domestic. an idol has been raised; the plinthly thing has simply not been knocked over. compare also horalith.
in a sentence: "she answered the question plinthly; it was hard to know what to add."