deep, soft
languorous, lazy, slow
slight
nasal
Southern, Texan, etc.

have
He had a slow, Southern drawl.

in a drawl
‘Howdy, pardner,’ he said in his slow Texan drawl.

with a drawl
She spoke with a soft Southern drawl.

lazily, slowly, softly
‘Come in!’ he drawled softly.

sarcastically, sardonically