1. Not classified hierarchically
   - nonhierarchical

See also: ungraded, unordered, unranked

• incorporative
• incorporeal
• incorporeality
• incorrect
• incorrectly
• incorrectness
• incorrigibility
• incorrigible
• incorrigibly
• incorrupt
• incorruptibility
• incorruptible
• incorruptibly
• incorruption
• incorruptness
• increase
• increased
• increasement
• increasing
• increasing monotonic
• increasingly
• incredibility
• incredible
• incredibleness
• incredibly