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dizzy [dizzy 词源字典]: dizzy: [OE] Dizzy originally signified ‘foolish, stupid’, a meaning which from the 13th century retreated into dialectal use and has only comparatively recently returned to the mainstream language in the milder form ‘scatterbrained’. The now central sense ‘giddy’ is recorded from the 14th century. The word comes from a West Germanic base *dus-, which also produced Dutch duizelen ‘be giddy’. Its formal and semantic similarity to doze and tizzy are obvious, but no actual etymological link between the three seems ever to have been established.
[dizzy etymology, dizzy origin, 英语词源]
ditzy (adj.): also ditsy, "stupid, scatterbrained" (especially of women), by 1973, U.S. slang, of unknown origin; one guess is that it is related to earlier U.S. black slang dicty (1926) "conceited, snobbish," also of unknown origin, but the sense is very difficult. The noun ditz (1982) appears to be a back-formation.
scatterbrain (n.): also scatter-brain, "thoughtless, giddy person, one incapable of serious, connected thought," 1764 (scatter-brained), from scatter (v.) + brain (n.). Related: Scatterbrained. Compare scatter-good "spendthrift."
scatty: "Absent-minded and disorganized", Early 20th century: abbreviation of scatterbrained.
scatty: "Absent-minded and disorganized", Early 20th century: abbreviation of scatterbrained.