Annoys me that "less" is always correct, which makes "fewer" completely redundant, and yet it's a short word that could be valuable in conversation if opened up and reused for something everyday that has a long name.
"Before I leave the house, I always check that I've got my keys, phone, and fure in my pockets."
I feel that 'gender' is probably a misleading term for the languages that have 'grammatical gender', it rarely has anything to do with genitalia. 'Noun class', where adjectives have to decline to agree with the class would fit better in most cases.
English essentially does not have decline adjectives, except for historical outliers like blond/e where no-one much cares if you don't bother, and uses his / hers / its / erc using a very predictable rule. So no 'grammatical gender'.