i-adjective
Describes someone, often a child or subordinate, who behaves in a disrespectfully bold or impertinent manner. The prefix 小 (こ) adds a nuance of 'a little' or 'somewhat', making it slightly milder than 面憎い.
See also: 面憎い
あの子は小面憎い口をきく。
That kid talks back cheekily.
小面憎いことを言うね。
You say some cheeky things, don't you?