Definitions

1. adjective

most prone to drifting; having the greatest tendency to move or change in a casual or unintentional way

“She was known for being the driftiest driver on the road, always getting lost in unfamiliar areas.”

2. adverb

in a drifting manner or way; with a tendency to move or change in a casual or unintentional way

“He was drifting along the highway, not paying attention to the road signs.”