Inexpert (adjective)

Not having or showing sufficient skill, knowledge or experience in a particular field or activity.

Origin:

Late 16th century, from in- "not" + expert, or from french inexpert.

Examples:

1. He was an inexpert cook and often burned his meals.
2. She played the piano with an inexpert touch, hitting many wrong notes.
3. The team's new recruit was an inexpert player and struggled to keep up with the others.
4. His inexpert attempt at repairing the car only made the problem worse.
5. She was an inexpert gardener and often killed her plants with too much water.