行为 (xíngwéi) is a neutral, general noun for 'behavior, conduct' — it covers any observable action or way of acting, without inherent moral judgment. It differs from 举动 (jǔdòng), which refers to a specific single 'move or action', and from 作为 (zuòwéi) and 品行 (pǐnxíng), which carry a stronger moral evaluation of one's conduct or character.