Self-taught and Unprepared

Self-taught adjective - Having skills or knowledge acquired through one's own efforts without formal training.

Unprepared and self-taught are semantically related. In some cases you can use "Unprepared" instead an adjective phrase "Self-taught".

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

Self-taught and unprepared are semantically related. Sometimes you can use "Self-taught" instead an adjective "Unprepared".