illegally的反义词是legally，illegally的意思是违法地，legally意思是合法地。
释义
adv.
按照法律，法律上；合法地
例句
1. A gambling debt is not legally enforceable.
赌债不能通过法律手段强制偿还。
2. It could be a bit problematic, legally speaking.
从法律上说，可能是有点问题。
3. The liquor was sold legally and trucked out of the state.
这种酒合法出售，由卡车运出该州。
