protected with a material that prevents heat, sound, electricity, etc. from passing through insulated wires a well-insulated house See related entries: Electronics, StructuresExtra examples Many financial institutions are now insulated against higher interest rates. The community was totally insulated from the outside world. The hot water tank should be insulated with proper insulating materials. The laboratory was well insulated against all outside noise. The wealthy feel completely insulated from an economic downturn. We are largely insulated from significantly higher costs.