He's just dabbling in photography and never intends to become a professional.

dabbling 是动词 dabble 的现在分词形式。dabble 本意是"轻轻拍打水面"，引申为"浅尝辄止、涉猎"的意思，常用来形容对某事只是随便尝试而不深入钻研的状态。