The Collaborative International Dictionary
Thievish \Thiev"ish\, a.
Given to stealing; addicted to theft; as, a thievish boy, a thievish magpie.
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Like a thief; acting by stealth; sly; secret.
Time's thievish progress to eternity.
--Shak. -
Partaking of the nature of theft; accomplished by stealing; dishonest; as, a thievish practice.
Or with a base and biosterous sword enforce A thievish living on the common road.
--Shak. [1913 Webster] -- Thiev"ish*ly, adv. -- Thiev"ish*ness, n.
Wiktionary
adv. In a thievish manner; like a thief.
WordNet
adv. in a manner characteristic of a thief
Usage examples of "thievishly".
If a leaf of the paper, which I warily, thievishly, moved, made but one rustle, how did that reveille boom through the haunted halls of my heart, and there was a cough in my swallow which for long I shirked to cough, till it burst with pitiless turbulence from my lips, sending crinkles of cold through my very soul: for with the words which I read were all mixed up visions of hearses crawling, palls, and wails, and crapes, and piercing shrieks of distraction pealing through vaults of catacombs, and all the mournfulness of that valley of shadow, and the tragedy of corruption.