かっぱつな combines 活 (katsu, 'lively') and 発 (hatsu, 'emit'), with a sokuon and rendaku-like effect on 発. Errors like かつはつな (missing sokuon or voicing) or がっぱつな (incorrect initial voicing) are common. It means active, lively, or energetic, describing something full of energy, movement, or positive activity.
「活発な」は、活(カツ)と発(ハツ)の音読みが結合し、促音「っ」と半濁音「ぱ」になります。かつはつな(誤読)やがっぱつな(濁音化)は間違い。元気が良く、活動的である様子を表します。
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