Green’s Dictionary of Slang

(orig. RAF jargon) risky, dangerous, dubious.

[1860		R.S. Surtees Plain or Ringlets? (1926) 55: Any one, however — any one on the sunny side of thirty — might be fairly excused for being duped by Johnny O’Dicey [...] the inexperienced would think he was the noblest-hearted fellow [...] a victim instead of a shark].
1950		‘Neville Shute’ Town Like Alice 303: He [...] made a tight, dicey turn round in the gorge with about a hundred feet to spare.
1959		C. MacInnes Absolute Beginners 68: At the same, he does like you to say you’re glad to see him once again, so it’s all a trifle dicey.
1961		K. Cook Wake in Fright [ebook] ‘Joe,’ he said, ‘your rifle’s more or less pointing at me.’ ‘Yeah.’ Joe was polite, but not concerned. ‘You’re sure it’s not loaded?’ ‘Yeah, it’s loaded.’ ‘Well— ah— isn’t it a little dicey?’.
1965		J.P. Carstairs Concrete Kimono 188: I blinked [...] trying to read what was going on in that highly dazzling but highly dicey mind.
1977		(con. 1941) R. Beilby Gunner 15: He wasn’t keen to have Yorgo with him in a dicey situation.
1981		J. Sullivan ‘Christmas Crackers’ Only Fools and Horses [TV script] No the belly’s a bit dicey. Sort of burning pains!
1989		R.G. Barrett Boys from Binjiwunyawunya 11: Having to order a hit, chase up a defaulting punter or sort out a dicey cop or politician.
1990		(con. early 1950s) J. Ellroy L.A. Confidential 318: Ellis Loew has an injunction prepared should things get dicey.
1991		R.G. Barrett Between the Devlin 149: The dicey scam with the bikies had gone over.
1998		K. Sampson Awaydays 110: We turn and head back the way we’ve just come [...] It’s a bit dicey.
2005		J. Stahl I, Fatty 122: To know how spooked Zukor was, you have to know how dicey the whole film business was looking.
2010		A. Steinberg Running the Books 78: I did learn an important lesson during one particularly dicey seagulling session.
2019		S.M. Jones Lives Laid Away [ebook] Humid funk. A sickly stew of sweat, farts, mold, dicey food, flat beer and premature ejaculation.
2020		D. Whish-Wilson Shore Leave 121: It would be dicey but he relied on the fact that he was white and they were black.
2021		J. Ellroy Widespread Panic 15: I’d head to Reno for a quickie [divorce], but it might not work. We got hitched in T.J., so the paperwork could get dicey.