under-employed

adjective

1. employed at a job that does not fully use one’s skills or abilities.
2. employed only part-time when one is available for full-time work.
3. not utilized fully.

noun

4. underemployed workers collectively.

adjective

1. not fully or adequately employed

adj.1908, “not used to optimum capacity,” originally in reference to working persons, from under + past participle of employ.