Insufferably

Martino became insufferably arrogant towards his subordinates.

During the concert, the crowd sang insufferably off-key, which made my ears hurt.

Many of the sentences from that individual are insufferably long.

He has good cards to play on making Brussels better and slimming the continent's heavyweight welfare states. Both can, not implausibly, be given a New Labourish colouring, though Mr Blair's lectures can sound insufferably Pecksniffian.