| Text | Length |
| Hard to combine, chemically | 27 |
| Hard to comprehend | 18 |
| Hard to connect with | 20 |
| Hard to control | 15 |
| Hard to corner | 14 |
| Hard to crack | 13 |
| Hard to cut with | 16 |
| Hard to deal with, as a problem | 31 |
| Hard to debate | 14 |
| Hard to define | 14 |
| Hard to describe | 16 |
| Hard to differentiate | 21 |
| Hard to dig up | 14 |
| Hard to discern | 15 |
| Hard to dispute, as a theory | 28 |
| Hard to endure | 14 |
| Hard to explain | 15 |
| Hard to fathom | 14 |
| Hard to figure out | 18 |
| Hard to find | 12 |
| Hard to find in Latin? | 22 |
| Hard to find, to Caesar | 23 |
| Hard to find, to Hadrian | 24 |
| Hard to fluster | 15 |
| Hard to follow | 14 |
| Hard to get | 11 |
| Hard to get a grip on | 21 |
| Hard to get a reaction out of | 29 |
| Hard to get a reaction out of? | 30 |
| Hard to get along with | 22 |
| Hard to get around | 18 |
| Hard to get clean | 17 |
| Hard to get close to | 20 |
| Hard to get hold of | 19 |
| Hard to get through | 19 |
| Hard to get through to | 22 |
| Hard to get to | 14 |
| Hard to get to know | 19 |
| Hard to go barefoot on | 22 |
| Hard to grasp | 13 |
| Hard to handle | 14 |
| Hard to hang on to | 18 |
| Hard to hear | 12 |
| Hard to hoe, perhaps | 20 |
| Hard to hold | 12 |
| Hard to hold down | 17 |
| Hard to hold on to | 18 |
| Hard to hold, in a way | 22 |
| Hard to hum, maybe | 18 |
| Hard to hum, perhaps | 20 |
| Hard to ignore | 14 |
| Hard to insure, maybe | 21 |
| Hard to interpret | 17 |
| Hard to keep hold of | 20 |
| Hard to keep in stock, say | 26 |
| Hard to let go of | 17 |
| Hard to lift | 12 |
| Hard to lift or move | 20 |
| Hard to look at | 15 |
| Hard to look at, in a way | 25 |
| Hard to make out | 16 |
| Hard to miss | 12 |
| Hard to move | 12 |
| Hard to nail down | 17 |
| Hard to open | 12 |
| Hard to outwit | 14 |
| Hard to pass on, as a highway | 29 |
| Hard to penetrate | 17 |
| Hard to pick up | 15 |
| Hard to pin down | 16 |
| Hard to please | 14 |
| Hard to please? | 15 |
| Hard to predict | 15 |
| Hard to rattle | 14 |
| Hard to reach | 13 |
| Hard to reach at the office, say | 32 |
| Hard to read | 12 |
| Hard to read by, as light | 25 |
| Hard to read, maybe | 19 |
| Hard to read, perhaps | 21 |
| Hard to recall | 14 |
| Hard to recollect | 17 |
| Hard to remember | 16 |
| Hard to research | 16 |
| Hard to resist | 14 |
| Hard to resolve | 15 |
| Hard to restrain | 16 |
| Hard to satisfy | 15 |
| Hard to saw, as some pine | 25 |
| Hard to see | 11 |
| Hard to see through | 19 |
| Hard to see through, say | 24 |
| Hard to see, perhaps | 20 |
| Hard to separate from | 21 |
| Hard to separate, perhaps | 25 |
| Hard to settle | 14 |
| Hard to sort out | 16 |
| Hard to spot | 12 |
| Hard to startle | 15 |
| Hard to stir | 12 |
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