Superlative form of 'blithe'; most carefree, lighthearted, or cheerful; happiest without concern.
From 'blithe' with the superlative suffix '-est,' used to form the highest degree of comparison (similar to 'happiest' or 'quickest'). This suffix comes from Old English.
Superlatives like 'blithest' are rarer today because we prefer 'most blithe,' but 300 years ago you'd see 'the blithest spirit' in literature all the time—English has slowly shifted toward longer but sometimes clearer comparative forms!
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