Superlative form meaning most prone to drifting, having the greatest tendency to be carried along without direction.
From 'drifty' (tending to drift) with the superlative suffix '-est.' This stacks three morphemes: 'drift' + '-y' (adjectival) + '-est' (superlative comparison).
The longest form 'driftiest' shows how English builds complexity by stacking suffixes—we start with a simple concept (drift), make it an adjective (drifty), then compare it multiple ways (driftier, driftiest).
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