Puttylike is an adjective used to describe something that is soft, malleable, and easily molded. Antonyms for this term include words such as hard, inflexible, rigid, and unyielding. These words describe things that are not easily molded and have a fixed shape. Other antonyms for puttylike include the words sturdy, strong, resilient, and robust. These words suggest strength and durability rather than softness and pliability. Additionally, words such as firm, solid, and steadfast can also serve as antonyms for puttylike, as they describe things that are stable, unwavering, and do not change easily.