compos mentis

The case is the same, betwixt a king non compos mentis, and one who is nondum compos mentis; a distracted or an infant-king.

Look here, old fellow, do you mean to assert that you are compos mentis?

That either husband or wife is a hopeless lunatic or non compos mentis.

Sarojini took particular pains to empress it upon me that Chavigny is non compos mentis.

Now and again would come a suppressed whistle, and then a low humming sound, backed up by a vacant non-compos-mentis smile.