thiefly /ˈθiːfli/adjective 1adverb 1forms 2 adjective1 •(no longer used) Like a thief; thievish.Most patiently, with noiseless tread, I then did Make thro' those sumptuous halls my thiefly way, Until at last I reached the chamber splendid Where Hobart Chatfield Chatfield slumb'ring lay. — 1893 adverb1 •(rare) Like a thief; thievishly.What great is living so thiefly!!! (Like a thief). — 1983 formsmore thiefly · most thiefly
