Spelling (Prefixes: il-, im-, in-, ir)
- illegal
- indent
- imperfect
- irregular
- inability
- immobile
- inaudible
- impatient
- individual
- insecure
- impolite
- illegible
- irresistible
- impartial
- illogical
- inappropriate
- improper
- ineffective
- immovable
- irrational
- jostled
- careening
- relishing
- falter
- supple
- taut
- frail
- engulf
- frayed
- undulating