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birdbrained, ditzy (or ditsy), dizzy, featherbrained, flighty, frivolous, frothy, futile, giddy, goofy, harebrained, light-headed, puerile, scatterbrained, silly, yeasty
earnest, serious, serious-minded, sober, unfrivolous
1575, in the meaning defined above
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marked by fawning attentiveness
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Conjugating an irregular verb
It relates to godfathers.
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