עָמַל

From LSJ

ἀναμαρτήτως ζῆν καὶ τοῖς ἄλλοις ἀλύπωςlive in a manner above reproach and without offence to others

Source

English (Strong)

a primitive root; to toil, i.e. work severely and with irksomeness: (take) labour (in).