Imminent
Likely to happen ; threatening
Ignoble
Dishonorable, shameful
Immolate
To kill someone as a sacrificial victim, usually by fire
Immutable
Unchangeable, fixed
Impalpable
Cannot be felt
Impecunious
Without money; penniless
Impendiment
A barrier ; obstruction
Imperative
Extremely necessary; vitally important
Imperious
Domineering; haughty
Impinge
To strike; to encroach
Importune
To persistently ask; to beg
Imprecations
A curse