condescend

(v) behave in a patronizing and condescending manner
(v) do something that one considers to be below one's dignity deign, descend,
(v) debase oneself morally, act in an undignified, unworthy, or dishonorable way
- I won't stoop to reading other people's mail
lower oneself, stoop,
(v) treat condescendingly patronise, patronize,

deign descend lower oneself stoop patronise patronize

condescending condescendingly condescendingness