| acerbity(noun, behavior, sharpness, bitterness, vindictiveness) |
| poison |
| acrimony(noun, resentment, sharpness, bitterness, maliciousness) |
| bitterness(noun, resentment, sharpness, acrimony, unpleasantness) |
| harshness(noun, pain, resentment, hostility, acrimony) |
| spleen(noun, bitterness, vindictiveness, maliciousness, venom) |
| virulence(noun, pain, resentment, hostility, bitterness) |
| acidity(noun, sharpness, bitterness, sourness) |
| acridity |
| asperity(noun, pain, resentment, hostility, sharpness) |
| malevolence(noun, bitterness, vindictiveness, maliciousness, venom) |
| malice(noun, bitterness, vindictiveness, maliciousness) |
| maliciousness(noun, bitterness, vindictiveness, venom, rancorousness) |
| resentment(noun, bitterness, vindictiveness, acrimony, maliciousness) |
| sharpness(noun, bitterness, sourness) |
| spite(noun, bitterness, vindictiveness, maliciousness) |
| tartness(noun, sharpness, bitterness, sourness) |
| venom(noun, pain, resentment, hostility, bitterness) |
| anger(noun, resentment, acrimony, unpleasantness) |
| antagonism(bitterness, vindictiveness, maliciousness) |