The term 'Slightest Sounds' can be summed up as the smallest audible noises. These noises are often too quiet to be heard by the human ear, but can be picked up by specialized equipment. The crossword solution for this term is 'PEEPS', which is an acronym for 'Pressure Equalization Electronic Ear Plugs'. These ear plugs are designed to amplify the faintest of sounds, allowing the user to hear even the slightest of noises.