thoughtlessly (part of speech: adverb)
absently (part of speech: adverb)
vacantly (part of speech: adverb)
unsubstantially (part of speech: adverb)
- Lilly was ashamed to cry before the clerk, who stood staring vacantly and whistling to himself, as she threw her things into the basket- trunk which her mother had intended to use for the move to the nine- roomed flat. - "The Song of Songs", Hermann Sudermann.
- He applied his foot to one of them, and it was not until he had used force, which in any other case he would have dispensed with, that the negro awoke from his state of lethargy and looked vacantly about him. - "The Pirate", Frederick Marryat.
- As I did so I noticed a man standing on the pavement close beside me looking vacantly across the street. - "A Rogue by Compulsion", Victor Bridges.