by chance, by accident, at random · without design, intent, or purpose · casually, fortuitously, rashly, heedlessly, thoughtlessly, inconsiderately, indiscreetly, idly
köken: From Proto-Italic *temezi (“in darkness, blindly”), a fossilised locative form of Proto-Indo-European *témHos (“darkness”), from *temH- (“dark”). Cognate with Sanskrit तमस् (támas), Persian تم (tam), Latin tenebrae (“darkness”). Compare this form – here simply adverbial – with the history of the Latin present active infinitive; see -ere.