Dryly

The barfly dryly brushes off suitors.

Source: tatoeba (817028)

This couple approaches humor so dryly that enormous chains of jokes will blossom without an iota of laughter.

Source: tatoeba (817030)

“Are you going?” said Mr. Chester, rising with a graceful indolence. “Let me light you down the stairs.” “Pray keep your seat,” returned the other dryly, “I know the way.” So, waving his hand slightly, and putting on his hat as he turned upon his heel, he went clanking out as he had come, shut the door behind him, and tramped down the echoing stairs. “Pah! A very coarse animal, indeed!” said Mr. Chester, composing himself in the easy chair again. “A rough brute. Quite a human badger!”

Source: wiktionary

The company were convulsed with laughter, all except the host himself, who dryly remarked: ‘Very amusing, Mr. Robert, very amusing, truly; ye're a clever lad, very clever; but just let me tell you, […]’

Source: wiktionary