In a dotty or scatterbrained manner; acting in a confused or silly way.
Formed from 'dotty' plus the adverbial suffix '-ly', which transforms adjectives into adverbs describing how something is done.
The -ly suffix is one of English's most productive word-building tools—you can add it to almost any adjective to create an adverb, which is why English speakers instinctively understand words like 'dottily' even if they've never heard it before.
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