| A | B |
| impolite | Not polite; discourteous; rude |
| informal | Causal relax |
| include | To be made up of, at least in part; contain |
| involve | To take in; include |
| individual | A single person considered separately from a group |
| improper | Not proper; incorrect |
| inquire | To ask in order to find out |
| innocent | Not guilty of a specific crime or fault |
| immediate | Occurring without delay |
| immigrant | A person who leaves his native country or region to settle in another |
| immovable | Not capable of moving or of being move; not portable |
| indirect | Not taking a direct or straightforward course |
| infection | The entry of germs into the body, where they multiply and damage tissue or cause disease |
| indent | To set the first line of a paragraph in from the margin |
| import | To bring or carry in from an outside source, especially to bring in from another country for trade, sale, or use |
| incomplete | Not finished |
| instrument | A device used by a musician in making music |
| inclined | Deviating from horizontal or vertical; slanting |
| immense | Of great, often immeasurable, size, extent, or degree; huge |
| inactive | Not active or not tending to be active; idle |
| insist | To be firm in one's demand |
| impress | To seem remarkable to: |
| improve | To make or become better |
| insult | To speak to or treat with contempt; offend |
| increase | To make or become greater or larger |
| imply | To say or convey indirectly; suggest without stating |
| infer | To conclude from evidence; deduce |
| impartial | Not practical; unwise; foolish |
| inflexible | Not flexible; rigid |
| inadequate | Not adequate; insufficient; not enough |