inconsiderable trifle

inconsistent conduct

inconsolable cares

incontestable inference

incontrovertible proof

incorrigible merriment

incorruptible constancy

increasing clamor

incredible swiftness

indecent saturnalia [saturnalia = unrestrained revelry; an orgy]

indecorously amused

indefatigable diligence [indefatigable = tireless]

indefeasible title [indefeasible = cannot be annulled]

indefinable reluctance

indefinite yearning

indelible obligation

indelicate impetuosity

indented outline

independent research

indescribably lugubriou [lugubriou = exaggerated gloom]

indestructible atoms

indeterminable value

indifferent promise

indigenous growth

indignant denunciation

indirect interrogation

indiscriminate censure

indispensable requisites

indisputable chronicler

indissoluble compact

indistinct association

individual valor

indivisible aspects

indolent neglect

indomitable pride

indubitable signs

indulgent construction

indwelling delight

ineffable disdain

ineffaceable incongruity [ineffaceable = indelible]

ineffectual blandishment

ineradicable coquetry

inestimable honor

inevitable corollary

inexcusable laughter

inexhaustible abundance

inexorable authority [inexorable = incapable of being persuaded]

inexplicable reluctance

inexpressible benignity

inextricable confusion

infallible judgment

infamous pretense

infantile simplicity

infectious hilarity

infelicitous arrangement

inferential method

infernal machinations

infinite deference

infinitesimal gradations

infirm purpose

inflamed curiosity

inflated optimism

inflexible integrity

influential voice

informing feature

infuriated demagogues

ingenious trick

inglorious victory

ingrained love

ingratiating exterior

inharmonious prelude

inherent dignity

inherited anxieties

inimitable felicity

iniquitous fortune

initiatory period

injudicious yielding

injured conceit

inky blackness

inmost recesses

innate forbearance

inner restlessness

innocent amenities

innocuous desuetude [desuetude = state of disuse or inactivity]