Old English scortlice "briefly," also, in late Old English, "in short time;" from short (adj.) + -ly (2).
he was at the airport shortly before she was expected to arrive
the book will appear shortly
he said shortly that he didn't like it
to put it shortly
the hem fell shortly below her knees
shortfall
shorthand
short-handed
shortlist
short-lived
shortly
shortness
short-order
shorts
short-sighted
short-sleeve