noun, na-adjective
worldly-wise; skilled at navigating life
Describes a person who is shrewd, practical, and knows how to succeed in society. Often carries a nuance of being savvy about human relationships and life's practicalities.
彼は処世達者で、どんな職場でもうまくやっていける。
He is worldly-wise and can get along well in any workplace.
処世達者な人は、人間関係のコツをよく知っている。
People who are skilled at navigating life know the tricks of human relationships well.
Compound of 処世 (shosei, 'conduct in life') and 達者 (tassha, 'skilled, proficient'). The exact historical derivation is uncertain, but the combination yields the meaning of being adept at navigating worldly affairs.