In a manner characterized by drifting; slowly moving without definite direction or control.
From 'drifting' (present participle of 'drift') plus the adverbial suffix '-ly.' The word builds: 'drift' + '-ing' (gerund/participle) + '-ly' (adverbial), creating three morpheme layers.
The adverb 'driftingly' is poetic and rare—English speakers might say 'drifting' as a verb form instead, but adding '-ly' forces it into pure adverbial duty describing how something moves.
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