Humidity

Moisture; Dampness; the amount of moisture in the air

Humiliate

To embarrass; to offend someone's pride or dignity

Hypothesis

An unproved theory

Illuminate

To provide with light; to make understandable; to clarify

Immaculate

Without spot or stain; free from error; without sin; pure

Immense

Very large; vast; enormous; boundless

Immortal

Living forever; everlasting; remembered or famous forever

Impediment

an obstruction of some kind; a speech disorder

Imperative

absolutely necessary; urgent

A command

Impertinent

deliberately disrespectful; rude and impolite