1 expressing negation (dishonest).
2 indicating reversal or absence of an action or state (disengage; disbelieve).
3 indicating removal of a thing or quality (dismember; disable).
4 indicating separation (distinguish; dispose).
5 indicating completeness or intensification of the action (disembowel; disgruntled).
6 indicating expulsion from (disbar).
Etymology: L dis-, sometimes through OF des-
Useful english dictionary. 2012.