earnestly; intently; determinedly
Archaic adverb expressing strong determination or earnestness. Not used in modern Japanese; encountered only in classical texts.
In classical texts, ひらさら is sometimes used to mean 'earnestly' or 'single-mindedly'.
the heck; in the world; on earth
Archaic emphatic interrogative, similar to 一体全体. Used in old expressions like 何ひらさら (what the heck). Not productive in modern Japanese.
See also: 一体全体 (いったいぜんたい)
In old language, it was used to strengthen questions, as in 何ひらさら (what on earth).
The origin is uncertain. It appears in classical Japanese as an adverb with two distinct uses: earnestness and emphatic interrogation. The kanji 平更 may be ateji.