| Hardest to get through | 22 |
| Hardest to get hold of | 22 |
| Hardest to get close to | 23 |
| Hardest to get at | 17 |
| Hardest to get | 14 |
| Hardest to find | 15 |
| Hardest to eat, as fish | 23 |
| Hardest to come by | 18 |
| Hardest to catch | 16 |
| Hardest substance in the human body | 35 |
| Hardest part of hitting for the cycle | 37 |
| Hardest part of a long run | 26 |
| Hardest part | 12 |
| Hardest human tissue | 20 |
| Hardest hit to get in baseball | 30 |
| Hardest hit to get | 18 |
| Hardest baseball hit to get | 27 |
| Hardest and strongest | 21 |
| Harder-won, perhaps | 19 |
| Harder up | 9 |
| Harder to unravel | 17 |
| Harder to traverse | 18 |
| Harder to travel, in a way | 26 |
| Harder to swallow, as bread | 27 |
| Harder to swallow | 17 |
| Harder to spot | 14 |
| Harder to solve | 15 |
| Harder to see through, say | 26 |
| Harder to see in | 16 |
| Harder to see | 13 |
| Harder to plow, perhaps | 23 |
| Harder to pin down | 18 |
| Harder to penetrate | 19 |
| Harder to outwit | 16 |
| Harder to make out, maybe | 25 |
| Harder to make out, as smoke | 28 |
| Harder to make out | 18 |
| Harder to look at | 17 |
| Harder to locate | 16 |
| Harder to lift, perhaps | 23 |
| Harder to hunt down | 19 |
| Harder to grasp | 15 |
| Harder to get | 13 |
| Harder to follow, as prose | 26 |
| Harder to follow, as a trail | 28 |
| Harder to find | 14 |
| Harder to explain | 17 |
| Harder to dig up | 16 |
| Harder to detach, maybe | 23 |
| Harder to cut through | 21 |
| Harder to crack | 15 |
| Harder to come by | 17 |
| Harder to believe | 17 |
| Harder to account for | 21 |
| Harder or softer, depending | 27 |
| Harder on the eyes | 18 |
| Harder on the ears | 18 |
| Harder | 6 |
| Hardens, variantly | 18 |
| Hardens, perhaps | 16 |
| Hardens, as fat | 15 |
| Hardens, as concrete | 20 |
| Hardens, as clay | 16 |
| Hardens, as cement | 18 |
| Hardens, as bones | 17 |
| Hardens with heat | 17 |
| Hardens or habituates | 21 |
| Hardens into bone | 17 |
| Hardens chemically | 18 |
| Hardens after time | 18 |
| Hardens (to) | 12 |
| Hardens | 7 |
| Hardening into bone | 19 |
| Hardening | 9 |
| Hardened volcanic froth | 23 |
| Hardened into bone | 18 |
| Hardened criminal | 17 |
| Hardened campaigner | 19 |
| Hardened by use | 15 |
| Hardened by heat and cold | 25 |
| Hardened by exposure | 20 |
| Hardened area on the ear? | 25 |
| Hardened (to) | 13 |
| Hardened (oneself) | 18 |
| Hardened | 8 |
| Harden: Var. | 12 |
| Harden, in a way | 16 |
| Harden, as troops | 17 |
| Harden, as plaster | 18 |
| Harden, as glue | 15 |
| Harden, as cement | 17 |
| Harden into bone | 16 |
| Harden by heat | 14 |
| Harden against PAin, etc. | 25 |
| Harden (Var.) | 13 |
| Harden (to) (Var.) | 18 |
| Harden (to) | 11 |
| Harden | 6 |
| Hardee's equivalent, out west | 33 |
| Hardcover? | 10 |