- illiteracy
- illogically
- illuminate
- illumine
- itinerant
- irrecoverable
- irregular
- irregularity
- irrelevance
- irrelevantly
- irreligiousness
- irrepressible
- irreproachably
- irresistible
- irresolution
- irrespective
- irresponsibility
- irreverent
- irritant
- irrupt
- irritative
- irruptive
- isinglass
- islam
- isobar
- israeli
- israelite
- isthmus
- italian capital
- italicize
- italics
- itch
- immature
- Indian coral tree
- indian hemp
- intoxicate
- introduction
- instruction
- indifferent
- inactive
- inexperienced person
- innocent
- innocence
- immersion
- industriousness
- insane
- inexorable
- intumesce
- impressiveness
- imaginativeness