inhibit

verb

1. prohibit, forbid, or prevent from doing something"Contact between the young was inhibited by strict social customs"
2. limit, block, or decrease the action or function of"inhibit the action of the enzyme"
3. consciously restrain from showing; of emotions, desires, impulses, or behavior"suppress a smile"
4. make (someone) self-conscious and as a result unable to act naturally"his father's cold and distant demeanor inhibited him emotionally"