In terms of impulse conduction in the neurons which term refers to the period whereby no neural impulse can be generated even with intense stimulation?

The term that refers to the period during which no neural impulse can be generated, even with intense stimulation, is called the "absolute refractory period." During this phase, the sodium channels are inactivated, preventing the generation of another action potential. Following this period, there is a "relative refractory period," where a stronger-than-normal stimulus is required to elicit a neural impulse.