| caustic definitions |
| # | Definition | Sets |
| 1 | burning | 67 sets |
| 2 | sarcastic | 56 sets |
| 3 | biting in wit | 56 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 | able to burn or eat away by chemical action; biting, sarcastic | 31 sets |
| 9 | biting, sarcastic; able to burn | 28 sets |
| 10 | burning; sarcastically biting | 27 sets |
| 11 | any chemical substance that burns or destroys living tissue | 24 sets |
| 12 | biting | 24 sets |
| 13 | sarcastic, biting | 22 sets |
| 14 | able to burn or eat away by chemical action | 20 sets |
| 15 | biting, sarcastic | 20 sets |
| 16 | biting and sarcastic | 19 sets |
| 17 | sarcastic and severe | 18 sets |
| 18 | harsh or corrosive in tone | 17 sets |
| 19 | corrosive | 17 sets |
| 20 | severely critical or sarcastic | 17 sets |
| 21 | (adj.) able to burn or eat away by chemical action; biting, sarcastic | 16 sets |
| 22 | biting; stingingly sharp or sarcastic | 16 sets |
| 23 | bitter, biting, acidic | 16 sets |
| 24 | capable of burning or corroding by chemical action; bitingly sarcastic, cutting | 16 sets |
| 25 | biting sarcastic or witty | 13 sets |
| 26 | biting sarcastic | 12 sets |
| 27 | stinging, biting | 12 sets |
| 28 | (adj) burning or stinging; causing corrosion | 12 sets |
| 29 | capable of burning, sarcastic | 12 sets |
| 30 | adj. capable of burning or corroding by chemical action; bitingly sarcastic, cutting | 12 sets |
| 31 | stinging | 12 sets |
| 32 | adj. sarcastic and severe. | 11 sets |
| 33 | sarcastic and severe. | 11 sets |
| 34 | capable of burning, corroding, or destroying living tissue | 11 sets |
| 35 | biting, burning, severe; sharp or sarcastic | 11 sets |
| 36 | biting, sarcastic, able to burn | 11 sets |
| 37 | marked by sarcasm. | 11 sets |
| 38 | burning, sarcastically biting | 10 sets |
| 39 | able to burn or eat away by chemical action; biting sarcastic | 10 sets |
| 40 | (adj.) bitter, biting, acidic (the politicians exchanged ___ insults for over an hour during the debate. | 8 sets |