[vivre, se promener, manger] alone, on one's own
vivre seul to live alone, to live on one's own
parler tout seul to talk to oneself
faire qch (tout) seul to do sth (all) by oneself, to do sth (all) on one's own
Elle a fait ça toute seule? Did she do it by herself?
Elle est venue seule. She came by herself.
seul à seul in private