| Term | Definition |
| heavy | (adj) a great amount |
| hectic | (adj) full of activity; very busy and fast |
| heed | (vt) pay attention to something, especially advice or a warning |
| henceforth | (adv) starting from this time |
| hilarious | (adj) extremely amusing and causing a lot of laughter |
| hinge | (nc) a metal fastening that joins the edge of a door, window, lid, etc. to something else and allows it to swing open or closed |
| hint | (nc) a piece of advice which helps you to do something |
| hoarse | (adj) (of a voice or a person) having a rough voice, often because of a sore throat or a cold |
| hoax | (nc) a plan to deceive someone, such as telling the police there is a bomb somewhere when there is not one, or a trick |
| hoe | (nc) a garden tool with a long handle and a short blade used to remove weeds and break up the surface of the ground |
| holocaust | (nc) a very large amount of destruction, especially by fire or heat, or the killing of very large numbers of people |
| homage | (nu) deep respect and often praise shown for a person or god |
| hubbub | (nu) a loud noise, especially caused by a lot of people all talking at the same time |
| hypothesis | (nc) an idea or explanation for something that is based on known facts but has not yet been proved |
| identical | (adj to~)exactly the same, or very similar |
| ignorant | (adj of/about) not having enough knowledge, understanding or information about something |
| ignore | (vt) intentionally not listen or give attention to |
| imminent | (adj) coming or likely to happen very soon |
| impartial | (adj) not supporting any of the sides involved in an argument |
| impartible | (adj)indivisible,not able to be separated from something else or into different parts |
| imply | (vt that~)communicate an idea or feeling without saying it directly |
| impromptu | (adj)done or said without earlier planning or preparation |
| incessant | (adj)never stopping, especially in an annoying or unpleasant way |
| incidental | (adj to~)less important than the thing something is connected with or part of |
| incisive | (adj)expressing an idea or opinion in a clear and persuasive way |
| incredible | (adj)impossible, or very difficult, to believe |
| indictment | (nc)LEGAL a formal statement of accusation,a reason for giving blame |
| induce | (vt 人to~inf)persuade someone to do something |
| inert | (adj) not moving or not able to move,not energetic or interesting |
| infest | (vt with~)(of animals and insects which carry disease) to cause a problem by being present in large numbers |
| ingredient | (nc) a food that is used with other foods in the preparation of a particular dish |
| inhabit | (vt) live in a place |
| initiate | (vt) cause something to begin |
| innovation | (nc/u)(the use of) a new idea or method |
| inquisitive | (adj) wanting to discover as much as you can about things, sometimes in a way that annoys people |
| inseparable | (adj) not able to be separated |