Ungraded and Unprepared

Ungraded adjective - Not arranged in order hierarchically.

Unprepared and ungraded are semantically related. in prepared topic. In some cases you can use "Unprepared" instead an adjective "Ungraded", when it comes to topics like crude, unrefined.

Unprepared adjective - Made or done without previous thought or preparation.

Ungraded and unprepared are semantically related. Sometimes you can use "Ungraded" instead an adjective "Unprepared".