English
inexplainable
From in- + explainable.
Formed from in- + explainable
Proto-Indo-European *pleh₂- ‘flat’
Proto-Indo-European *pl̥h₂nós
Proto-Italic *plānos
Latin plānus ‘level, flat, even’
Latin explanō ‘to flatten, spread out, make plain or clear,…’
English explainable
Today it means
adj That cannot be explained.
Language periods are conventional ranges, not dates for this word.
Etymograph / inexplainable