ACIDIC
| Date | Clue |
|---|---|
| 2026-07-12 | Far from basic |
| 2026-02-22 | Like pickles, but not cucumbers |
| 2024-01-01 | Opposite of basic, in chemistry |
| 2023-01-12 | Hardly basic |
| 2022-05-18 | By no means basic |
| 2022-01-15 | Like apples and oranges |
| 2021-01-25 | Like vinegar |
| 2020-05-25 | Like vinegar |
| 2020-01-26 | Low-pH |
| 2017-02-18 | Cutting |
| 2014-08-01 | Very harsh |
| 2014-06-12 | Sour |
| 2013-09-22 | Like citrus fruits |
| 2008-05-13 | Vinegary |
| 2008-01-19 | Sharp |
| 2001-01-18 | Like sour grapes |
| 1997-06-12 | Not basic |
| 1995-11-27 | Tart |