the word 'swiftness' is a native english formation, built from the old english adjective swift, meaning 'quick, fleet, ready'. the root of swift is the proto-germanic swiftaz, derived from the verb swībaną meaning 'to sweep, move quickly'. the suffix -ness is one of the most common and productive noun-forming suffixes in english, originating from the old english -nes, which itself descends from the proto-germanic -inassu-. this suffix consistently denotes an abstract state, condition, or quality. therefore, the literal morphemic construction 'the state of being swift' evolved seamlessly into the modern abstract noun meaning 'the quality of speed or rapidity'.

Structure: swift (fast) + ness (state or quality) swift (from old english swift, meaning 'moving quickly') + ness (from old english -nes, a suffix forming nouns indicating a state or quality)