GRE

impenetrable - not able to be pierced or entered

impenitent - not repentant

imperial - like an emperor; related to an empire

imperiousness - lordliness; domineering manner; arrogance

impermeable - impervious; not permitting passage through its substance :: impenetrable impassable impervious

impertinent - insolent

imperturbable - calm; placid :: serene

impervious - not penetrable; not permitting passage through :: resistant impenetrable impermeable

impetuous - violent; hasty; rash

impetus - moving force; incentive; stimulus :: incentive motivation stimulus catalyst impulse motivation

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