Inept (adjective)

Not suitable or capable; incompetent.

Origin:

From latin ineptus ("unsuitable, unfit, imprope.r")

Examples:

1. The inept manager was unable to make any decision.
2. It was clear that the employee was inept at her job.
3. The politician was inept at handling the crisis situation.
4. The team's performance was hampered by the inept leadership of its coach.
5. The movie was criticized for its inept pacing and weak plot.