Entry: adenoidal (adj.)
In context: “…writhing groggily and Nyquilized around on the bed and making honking adenoidal noises and asking what in the bloody hell is the meaning of this…”
Definition: Most likely this one: colloq. (usu. somewhat depreciative). Of the voice, speech, an accent, etc.: having a monotonous and constricted nasal quality.
SNOOT score: 1
Source: Oxford English Dictionary