More foolish, silly, or eccentric than something else; comparative form of 'doty' or 'doty'.
Comparative form of 'doty' (meaning silly or scatter-brained), from obsolete English 'dote' meaning to be silly or infatuated, with '-y' suffix creating adjectives.
The progression from 'dote' (to be foolishly affectionate) to 'dotty' to 'dotier' shows how English can take emotional words and make them describe personality traits over time.
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