What is the adjective of idly?

There isn't a direct adjective form of "idly." However, depending on the context you're looking for, you can use several alternatives:

For "doing something without much thought or effort":

* Careless: This implies a lack of attention and potentially leading to mistakes.

* Indifferent: This suggests a lack of interest or concern.

* Passive: This implies a lack of action or initiative.

* Listless: This describes a lack of energy or enthusiasm.

* Unconcerned: This indicates a lack of worry or anxiety.

For "in a relaxed or leisurely way":

* Leisurely: This describes something done slowly and without rush.

* Relaxed: This indicates a state of ease and calm.

* Unhurried: This implies a lack of haste or urgency.

* Serene: This suggests a peaceful and tranquil state.

The best choice will depend on the specific nuance you want to convey.