| irradier de bonheur | beam |
| irradier de joie | beam |
| irraisonné | foolish |
| Irrationalité de e | Proof that e is irrational |
| irrationnel | preposterous |
| Irrationnel quadratique | Quadratic irrational |
| Irrawaddy | Ayeyarwady River |
| Irrel | Irrel |
| irremboursable | irredeemable |
| irremplaçable | irreplaceable |
| irrespect | disrespect |
| irrespectueusement | disrespectfully |
| irrespectueux | ill-mannered |
| irresponsabilité | irresponsibility |
| irresponsable | irresponsible |
| Irresponsable capitaine Tylor | The Irresponsible Captain Tylor |
| irresponsablement | unaccountably |
| Irrigable | Irrigated land |
| irrigation | irrigation |
| Irrigation à pivot central | Center pivot irrigation |
| irriguer | irrigate |
| irritabilité | irritability |
| irritable | grouchy |
| irritant | galling |
| irritation | annoyance |
| irritation due à la chaleur | heat rash |
| irriter | annoy |
