Somewhat silly, foolish, or giddy; having the quality of being daffy in a mild way.
From 'daff' (foolish) + adjective suffix '-ish', which softens the meaning and suggests 'somewhat' or 'rather' foolish rather than completely foolish.
The suffix '-ish' is English's way of saying 'kind of' or 'sort of'—it makes adjectives less harsh and more playful, which is perfect for describing someone's silly mood rather than their character.
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