| Iroquois people | 15 |
| Iroquois Reservation | 20 |
| Iroquois tribe | 14 |
| Iroquois tribe for which one of the Finger Lakes is named | 57 |
| Iroquois tribe for which Syracuse's county is named | 55 |
| Iroquois tribesmen | 18 |
| Iroquois tribespeople | 21 |
| Iroquois' foes | 18 |
| Irradiate | 9 |
| Irradiated | 10 |
| Irrational | 10 |
| Irrational anxiety | 18 |
| Irrational art | 14 |
| Irrational distrust | 19 |
| Irrational dread | 16 |
| Irrational fear | 15 |
| Irrational motives | 18 |
| Irrational number | 17 |
| Irrational numbers | 18 |
| Irrational numbers, in math | 27 |
| Irrational numbers? | 19 |
| Irrational outbursts | 20 |
| Irrational quantity | 19 |
| Irrational root | 15 |
| Irrational speeches | 19 |
| Irrational way to go | 20 |
| Irrational weeping over a broken spar? | 38 |
| Irrational zeal | 15 |
| Irrational, in math. | 20 |
| Irrational, to mathematicians | 29 |
| Irrationality | 13 |
| Irrationally afraid | 19 |
| Irrationally fearful | 20 |
| Irreconcilables | 15 |
| Irredeemable | 12 |
| Irredeemably bad | 16 |
| Irreducible | 11 |
| Irrefutable | 11 |
| Irrefutable evidence | 20 |
| Irreg. | 6 |
| Irreg. spelling | 15 |
| Irregardless | 12 |
| Irregular | 9 |
| Irregular courses | 17 |
| Irregular edge, as for a book page | 34 |
| Irregular fighter (Var.) | 24 |
| Irregular folds | 15 |
| Irregular French verb | 21 |
| Irregular glacial mass | 22 |
| Irregular impulsive moves | 25 |
| Irregular in quality | 20 |
| Irregular mark | 14 |
| Irregular marks | 15 |
| Irregular mathematical shape | 28 |
| Irregular paper edge | 20 |
| Irregular soldier | 17 |
| Irregular spot | 14 |
| Irregular stain | 15 |
| Irregular strophe in a chanson de geste | 39 |
| Irregular test patterns | 23 |
| Irregular trial venue | 21 |
| Irregular triangles | 19 |
| Irregular, as a leaf's edge | 31 |
| Irregular, as if gnawed away | 28 |
| Irregular, as if gnawed on | 26 |
| Irregular, as leaf edges | 24 |
| Irregular, in Inverness | 23 |
| Irregular, often | 16 |
| Irregular; queer | 16 |
| Irregularity | 12 |
| Irregularly | 11 |
| Irregularly edged | 17 |
| Irregularly incised | 19 |
| Irregularly indented | 20 |
| Irregularly notched | 19 |
| Irregularly notched, as a leaf | 30 |
| Irregularly shaped disks | 24 |
| Irregularly shaped piece of furniture | 37 |
| Irregularly shaped spot | 23 |
| Irregularly shaped stain | 24 |
| Irregularly toothed | 19 |
| Irregularly worn | 16 |
| Irregularly: bot. | 17 |
| Irrelevant | 10 |
| Irrelevant facts, slangily | 26 |
| Irrelevant remark | 17 |
| Irrelevant to Don King? | 23 |
| Irrelevant, as a point | 22 |
| Irreligious | 11 |
| Irreligious individuals [Greece] | 32 |
| Irreligious one | 15 |
| Irreligious person | 18 |
| Irreligiousness | 15 |
| Irreparable | 11 |
| Irreparably broken | 18 |
| Irreparably cracked | 19 |
| Irreparably damage | 18 |
| Irrepressible | 13 |
| Irrepressible lecturers | 23 |
| Irreproachable | 14 |