incompetent
adjective/ɪnˈkɑmpɪtənt/
Frequency rank: #6,433 of 20,003 in the WORDED list (wordfreq data)
Meaning
lacking the skill or ability to do something properly.

Example sentence
The manager was fired because he was completely incompetent at his job.
Synonyms & related words
More words in ranks 6,401–6,500
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