1. Wrong use of language 
2. Bad treatment; abuse

Derived forms: misusages

• insipid
• insipidity
• insipidly
• insipidness
• insist
• insistence
• insistency
• insistent
• insistently
• insisting
• insobriety
• insofar
• insolate
• insolation
• insole
• insolence
• insolent
• insolently
• insolubility
• insoluble
• insolvable
• insolvency
• insolvent
• insomnia
• insomniac