incompetent adj.
VERBS appear, be | adjudge sb/sth, consider sb/sth I know my boss considers me incompetent.
ADV. grossly, hopelessly, singularly a grossly incompetent piece of reporting | completely, totally, utterly | managerially, socially, technically | mentally
PREP. at He is utterly incompetent at his job.
You can also check other dicts: incompetent (English, 中文解释 ), wordnet sense, Collins Definition