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insubordination unwillingness to obey orders or submit to authority.
insubstantial lacking firmness or substance; not substantial; slight. [2 definitions]
insufferable incapable of being tolerated or endured; unbearable.
insufficiency the quality or condition of being insufficient; deficiency; lack. [2 definitions]
insufficient inadequate in number, degree, amount, or quality; not sufficient.
insular of or relating to an island or the formation of an island. [4 definitions]
insularity the condition of being closed to new ideas or outside influences; narrow-mindedness.
insulate to cover, line, or surround with a substance that reduces or stops the transfer of heat, electricity, or sound. [2 definitions]
insulation material used to insulate. [2 definitions]
insulator a person, thing, or material that insulates. [2 definitions]
insulin a hormone of the pancreas that controls the metabolism of carbohydrates by regulating the level of glucose in the blood. [2 definitions]
insulin shock hypoglycemia caused by excessive insulin in the blood, and characterized by shakiness, cold sweat, convulsions, and eventually coma.
insult to offend by speaking to or treating rudely or contemptuously. [4 definitions]
in sum in concise form or summary.
insuperable not able to be conquered or overcome.
insupportable not tolerable; unbearable. [2 definitions]
insurance a guarantee of protection against certain misfortunes that is provided by a company in return for payment of a fee. [3 definitions]
insure to guarantee against loss or harm, as with an insurance policy. [3 definitions]
insured someone protected by an insurance policy.
insurer someone or something that insures, esp. a person or company in the business of guaranteeing protection or compensation in case of loss or harm.
insurgence an insurrection; rebellion.