masc acc pl of haṭṭhapahaṭṭha (adj); nt acc pl of haṭṭhapahaṭṭha (adj); masc loc sg of haṭṭhapahaṭṭha (adj); nt loc sg of haṭṭhapahaṭṭha (adj); …
Analysis. Compound: haṭṭha 'pleased, joyful' + pa-haṭṭha 'very pleased' (pa- intensifying prefix + haṭṭha); the doubling creates a strong emphatic sense of joy and excitement.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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