When you are late for absolutely no reason, this is an example of inexplicable tardiness.
Origin of inexplicableFrench from Classical Latin inexplicabilis
- in·ex′pli·ca·bil′i·ty in·ex′pli·ca·ble·ness
(comparative more inexplicable, superlative most inexplicable)
- Impossible to explain; not easily accounted for.
From Middle English inexplicable, from Middle French inexplicable, from Latin inexplicabilis, from in- (“not”) + explicabilis (“explicable”).