An example of condescending is a parent who speaks to her grown child as if he were still a toddler.
Quit talking to me in that condescending tone! You always treat me like a child – ugh!
He seemed to be condescending to his companion.
He read it with the same condescending tone with which it was written.
His condescending tone was as annoying as the words.
Jackson always picked some condescending nickname for her beaus.
Your condescending tone is making me feel patronized and insulted.