insensato
From LSJ
πενία μόνα τὰς τέχνας ἐγείρει → poverty alone promotes skilled work, necessity is the mother of invention, necessity is the mother of all invention, poverty is the mother of invention, out of necessity comes invention, out of necessity came invention, frugality is the mother of invention
Spanish > Greek
εἰκαῖος, ἀφραδής, ἔκφρων, ἐμβρόντητος, ἀμαθής, ἄσοφος, ἀλόγιστος, ἀνόητος, ἀσύνετος, ἀνοήμων, ἀλόγητος, δυσλόγιστος, ἀφράδμων, δαλής, δύσφρων, ἄφρων, ἀγνώμων, ἀλιτόφρων, ἀφρονικός, ἄνοος, ἀπερίσκεπτος, ἀβούλητος, ἀναίσθητος, ἀλογίστευτος, ἄβουλος, ἀπόπληκτος, ἀνεγκέφαλος, ἀνεμώλιος