What is the antonyms for befriend?
To befriend means to offer help to and support someone, or get to know them in the interest of being friends. Words that have an opposite meaning would include:
Ignore and avoid are antonyms in the sense that you wouldn't make any effort to an individual.
Discourage, thwart, neglect, or harm are antonyms that mean to interfere with or hurt an individual.
You would befriend a befriend soon to be husband's sister the same way you would befriend anyone you wanted to be a friend of. Try planning events involving the three of you, that way you can get to know her better and it wouldn't be as odd. Also, try finding things she likes that you could do together.
People cannot befriend tigers because they are wild animals and they will attack you. They are not domestic and they are not friendly. Unless you train them to be friendly and maybe you can befriend them at that point. Baby tigers can be befriended because they are babies and they don't know what they are doing.