I am looking for adjectives to describe the size of tube shape objects such as a rope, stick, bat, or carrot. I want to describe if the diameter is large or small. Do people just say big and small? Or is there any specific and common way to describe large and small diameter? Thank you!
Thick and thin are generally used to describe the transverse dimension of some long object, whether it's cylindrical or not. You also hear fat and skinny.
Less common, but still possible are wide and narrow. In cases where diameters have numerically-defined standards (e.g., electrical wires or plumbing pipes), you might hear wide gauge and narrow gauge.