Definition of "Delphic"

He telephoned airlines, government contacts and a whole host of pale, over-brushed acquaintances in the U.S. Consulate, who infuriated him with arch and Delphic answers.

1977, John Le Carré, The Honourable Schoolboy, Folio Society, published 2010, page 18

Carthage now sent two embassies to Rome, one after the other, essentially to ask forgiveness and avert war. The first was told enigmatically that it would depend on "if the Carthaginians give satisfaction to the Romans". The ensuing embassy received the still more delphic reply that "the Carthaginians knew very well" what this meant.

2010, Dexter Hoyos, The Carthaginians, Routledge, page 215