'drearily' originates from the Old English word 'drēorig,' where 'drēor' meant 'gore' or 'blood,' and the suffix '-ly' was added to form the adverb.

'drēorig' transformed into the Middle English word 'dreary,' and eventually became the modern English word 'drearily.'

Initially, it meant 'bloody' or 'gory,' but over time it evolved into its current meaning of 'dull and lifeless.'