(a.) Filled with, or showing, spite; having a desire to vex, annoy, or injure; malignant; malicious; as, a spiteful person or act.

acrid acrimonious antagonistic antipathetic bearish belligerent bitchy bitter cankered cantankerous cattish catty caustic churlish clashing colliding conflicting crabbed cranky cross cross-grained crusty cussed despiteful disagreeable evil excitable feisty fractious full of hate hateful hostile huffish huffy invidious irascible irritable malevolent malicious malign malignant mean ornery perverse punitive quarrelsome rancorous repugnant retaliative retaliatory retributive retributory revengeful set against snappish sore spleeny splenetic testy ugly unforgiving unfriendly vengeful venomous vicious vindictive virulent vitriolic waspish wicked