Uninteresting
Unreal
Unpredictable
Unnecessary
Ungrateful
Unexpected
Unfortunate
Unhappy
Unsafe
Unusual
Irresponsable
Irradical
Irritating
Irrational
Irascible
Ironhearted
Ironic
Irregular
Irresistable
Irritable
Inaccurate
Inacceptable
Indefinite
Intolerable
Indifferent
Intriguing
Indiscutable
Inoperable
Inactive
Intolerant
Important
Imaginary
Impossible
Imbalanced
Imperfect
Immature
Immense
Imminence
Immune
Impatient
