## Etymology
From unbelievable + -ly. Believe descends from Old English belyfan, geliefan ('to believe, trust'), from Proto-Germanic *galaubjan ('to hold dear, trust'), from the Proto-Indo-European root *leubh- ('to care, desire, love').

## AI Etymology
Unbelievably comes from unbelievable + -ly. Believe descends from Old English belyfan, geliefan ('to believe, trust'), from Proto-Germanic *galaubjan ('to hold dear, trust'), from the Proto-Indo-European root *leubh- ('to care, desire, love'). The suffix is part of the word's derivational shape, marking the final grammatical or semantic role while the base supplies the central meaning. As an adverb, it means "to an extent that is hard to credit; remarkably", so the modern sense keeps the older action or relation visible. Relevant historical forms include Old English un-, Old English geliefan, and Proto-Indo-European *leubh-. Related words include unbelievable, believe, belief, unbelief.

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- Describing Qualities
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