Definition of "adenoidal"

There he ordered beer from the adenoidal Chinese manager and drank the afternoon away, greedily swilling bottle after bottle, feeling gradually his adulthood return.

1958, Anthony Burgess, The Enemy in the Blanket (The Malayan Trilogy), published 1972, page 344

Metzger, acting on instructions in the will, had retained this amiable, slightly adenoidal expert, for a percent of his valuation, to inventory and appraise Inverarity's stamp collection.

1966, Thomas Pynchon, chapter 4, in The Crying of Lot 49, New York: Bantam Books, published 1976, page 68

Neither man has an alternative career in audiobook narration awaiting him upon retirement. Ron DeSantis speaks in a sort of monotone nag. Rishi Sunak can sound adenoidal.

2023 August 8, Janan Ganesh, “The oneness of Ron DeSantis and Rishi Sunak”, in Financial Times‎