Underarms...

Don’t shave !!  It only makes the hair thicker. Try waxing, the hair will then be removed completely for up to a week or so. Your hair will still grow back ,but after a few years it will grow back thinner and at a slower pace. You could also go for laser hair removal, which is done with a laser beam and provides permanent hair reduction. Usually after the treatment, there aren't any possibilities of hair regrowth. Another option is electrolysis which is another method of removing hair permanently. It is more painful than laser hair removal as it involves inserting a needle into each hair follicle. But I prefer waxing, it’s not too expensive and not as painful as electrolysis.