頗る

sukoburu
extremely, very much

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First off, I doubt that many people would write it as 頗る. It's probably more common to see it spelled out it hiragana: すこぶる. But I love learning new kanzi.
Secondly, the other odd thing about this is that it's an adverb that doesn't look like one. In fact, it looks like a verb, ending in ru as it does. You expect it, at first, to be conjugated, but no, it only appears in this form, which makes sense, once you know the meaning.