The phrase 'they're the pits' is an idiom that means something is very bad or unpleasant. The crossword solutions for this phrase are SEEDS (5 letters), ABYSM (6 letters), CHASM (6 letters), NADIR (6 letters), and STONES (6 letters). All of these words have to do with deep holes, which is a metaphor for how bad or unpleasant something can be. Seeds represent the potential for something to grow, but they can also be buried in the ground and forgotten. An abyss is a deep, dark hole, and a CHASM is a large crack in the earth. NADIR is the lowest point, and STONES are often found at the bottom of a pit. All of these words together help to illustrate the meaning of the phrase 'they're the pits.'