accusative singular feminine of piṭṭhiṭṭhikā (feminine noun); adjective or noun form attested in AN 5.48
Analysis. piṭṭhi (back, rear) + iṭṭhika (from iṭṭha, desired, liked, forming an adjective meaning inclined to); the compound expresses clinging to or preference for what lies behind—literal or figurative resistance to progress.
Etymology. piṭṭhi is the back or rear; the suffix -iṭṭhika (from iṭṭha, past participle of icchati to wish) creates an adjective meaning inclined toward or preferring. Used in monastic contexts for spiritual backsliding.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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