The brain is amazing - I realized how much I rely on visual cues for hearing when I very faintly "heard" a GIF of someone mouthing the words f* you!
Another thing is the ambiguity that comes with not really hearing high pitched sounds - many words with consonants become very hard to distinguish. "Cat - hat - sat" are similar visually and if you only hear "at - at - at", your brain is still able to tell which one is the correct by context. This is terrible when learning a new language though.
