| caustic definitions |
| # | Definition | Sets |
| 1 | burning | 68 sets |
| 2 | sarcastic | 61 sets |
| 3 | biting in wit | 58 sets |
| 4 | burning or stinging; causing corrosion | 44 sets |
| 5 | like acid; corrosive | 41 sets |
| 6 | burning; corrosive; able to burn by chemical action; sarcastically biting; (of remarks) intended to hurt; bitter; harmful; op. harmless | 40 sets |
| 7 | bitingly sarcastic or witty | 38 sets |
| 8 | biting and sarcastic | 37 sets |
| 9 | biting, sarcastic; able to burn | 32 sets |
| 10 | able to burn or eat away by chemical action; biting, sarcastic | 31 sets |
| 11 | burning; sarcastically biting | 28 sets |
| 12 | biting | 27 sets |
| 13 | any chemical substance that burns or destroys living tissue | 26 sets |
| 14 | sarcastic, biting | 25 sets |
| 15 | biting, sarcastic | 21 sets |
| 16 | biting; stingingly sharp or sarcastic | 20 sets |
| 17 | able to burn or eat away by chemical action | 20 sets |
| 18 | corrosive | 19 sets |
| 19 | sarcastic and severe | 19 sets |
| 20 | harsh or corrosive in tone | 19 sets |
| 21 | severely critical or sarcastic | 17 sets |
| 22 | (adj.) able to burn or eat away by chemical action; biting, sarcastic | 16 sets |
| 23 | capable of burning or corroding by chemical action; bitingly sarcastic, cutting | 16 sets |
| 24 | bitter, biting, acidic | 16 sets |
| 25 | stinging | 14 sets |
| 26 | biting sarcastic or witty | 13 sets |
| 27 | (adj) burning or stinging; causing corrosion | 13 sets |
| 28 | biting sarcastic | 12 sets |
| 29 | stinging, biting | 12 sets |
| 30 | adj. capable of burning or corroding by chemical action; bitingly sarcastic, cutting | 12 sets |
| 31 | capable of burning, corroding, or destroying living tissue | 12 sets |
| 32 | capable of burning, sarcastic | 12 sets |
| 33 | biting, burning, severe; sharp or sarcastic | 11 sets |
| 34 | biting, sarcastic, able to burn | 11 sets |
| 35 | sarcastic and severe. | 11 sets |
| 36 | adj. sarcastic and severe. | 11 sets |
| 37 | marked by sarcasm. | 11 sets |
| 38 | burning, sarcastically biting | 10 sets |
| 39 | harsh | 10 sets |
| 40 | corrosive; cutting; causing a burning or stinging sensation as from intense emotion; sarcastic | 9 sets |