/ ˌɪnɪkˈsplɪkəbl; NAmE / adjective
that cannot be understood or explained
SYN incomprehensible :
inexplicable behaviour
For some inexplicable reason he gave up a fantastic job.
OPP explicable
► in·ex·plic·ably adverb :
inexplicably delayed / absent
She inexplicably withdrew the offer.
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WORD ORIGIN
late Middle English : from French , or from Latin inexplicabilis that cannot be unfolded, from in- not + explicabilis (from explicare , from ex- out + plicare to fold).