on some occasions <sometimes I like to go skiing, and sometimes I prefer to stay inside where it's warm>
Phrases at times, ever and anon, every now and then (or every now and again or every so often), from time to time, once in a while, on occasion
Near Antonyms frequently
Seen & Heard
What made you want to look up sometimes? Please tell us where you read or heard it (including the quote, if possible).