Hypo/hyper

‘Hypo’ means ‘under’ and ‘Hyper’ means ‘over’. For example, someone who is hypersensitive to sound is oversensitive to noises and may get a fright even from a non threatening sound like a door closing. Someone who is hyposensitive to sound is undersensitive to noises and may not react with the right level of urgency to a threatening sound like a gunshot.