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 optimism

inviolable confidence

involuntary yearnings

involuted sentences [involuted = intricate; complex]

involved pomposity

invulnerable solemnity

inward disinclination

irascible doggedness

irate remonstrance

iridescent sheen

irksome task

iron resolution

ironic iciness

irradiating spirit

irrational awe

irreclaimable dead

irreconcilable parting

irrecoverably lost

irrefragable laws [irrefragable = indisputable]