incompetent

noun

1
Unskilled; lacking the degree of ability that would normally be expected.
“Having an incompetent lawyer may be grounds for a retrial, but the lawyer in question probably doesn't know that.”
2
Unable to make rational decisions, insane or otherwise cognitively impaired.
“The charged was judged incompetent to stand trial, at least until his medication started working.”
3
Of the cervix: opening too early in pregnancy, provoking the baby to be born.
4
Not resistant to deformation or flow.

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