insatiable /ɪnˈseɪʃ(j)əbəl/adjective 1noun 1forms 3 adjective1 •Not satiable; incapable of being satisfied or appeased; very greedy.Guestling, who adds an insatiable jealousy to his other domestic virtues, vetoed the new acquaintance and thenceforward the two met hurriedly and furtively in town. — 1923 noun1 •One who or that which cannot be satiated. formsinsatiables · more insatiable · most insatiable