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adverb (fukushi), nouns which may take the genitive case particle 'no', adjectival nouns or quasi-adjectives (keiyodoshi)
very, greatly, much, considerably, to a large extent, quite
余 is atejiword usually written using kana alone-
あいつがガッツポーズするなんて、よっぽど嬉しかったんだろうな。
It must have been something really big for him to strike a triumphant pose like that.
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adverb (fukushi)
just about to, almost, very nearly
word usually written using kana alone