Lingaku- overly polite; excessively polite; polite to a fault
adjectival nouns or quasi-adjectives (keiyodoshi); noun (common) (futsuumeishi)
Generated: This term is used to describe someone who is excessively formal or meticulous in their politeness, often to the point where it feels unnatural or exaggerated. It can be used to convey both admiration for someone's manners or a criticism of their over-the-top politeness.