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]

innovating spirit

inoffensive copiousness

inopportune condition

inordinate ambition

inquisitional rack

inquisitive observer

insatiable vanity

inscrutable austerity

insecure truce

insensate barbarism

insensibly flattered

inseparably associated

insidious tendency

insignificant blot

insincere profession

insinuatingly pursued

insipid tameness

insistent babel

insolent placidity

insoluble riddles

inspiring achievement

inspiriting spectacle

instant readiness

instantaneous cessations

instinctive disapproval

insufferably dull

insufficient appeal

insular strength

insulting invectives [invective = abusive language]

insuperable difficulty

insurmountable obstacles

intangible something

integral element

intellectual integrity

intelligent adaptation

intemperate scorn

intense perplexity

intensive cultivation

intentional garbling

interior spirit

interlocking directorate

intermediate link

interminable question

intermingled gloom

intermittent threats

internal dissension

interpolated speech

interpretative criticism

interwoven thread

intimately allied

intolerably tedious

intoxicating hum

intractable temper

intrenched privilege

intrepid dexterity

intricate interlacings

intriguing braggart

intrinsic fecundity [fecundity = productive or creative power]

intrusive brightness

intuitive perception

invaluable composition

invariable kindness

inveighing incessantly [inveighing = angry disapproval]

inventive jealousy

inveterate antipathy

invidious mention [invidious = rousing ill will or resentment]

invigorating discipline

invincible