The OED takes the strain:
Pinteresque, adj. (and n.) Brit. /pntrsk/, US /pn(t)rsk/ [< the name of Harold Pinter (b. 1930), British playwright + -ESQUE suffix. Cf. PINTERISH adj.]
Of or relating to Harold Pinter; resembling or characteristic of his plays. Also occas. as n. Pinter's plays are typically characterised by implications of threat and strong feeling produced through colloquial language, apparent triviality, and long pauses.This may also explain my difficulty in understanding the son and heir: he is exactly like the rest of us.