Funny how language works! Take this one, for instance:
Dern
Of persons, proceeding in secret or in the dark; kept concealed; hence of evil or deceitful nature. Of persons, secret in purpose or action; reserved; hence, underhanded. sly, crafty. Of a person, treated as a confidant; entrusted with hidden matters. Of places, serving well to conceal, as lying out of the way.
Sir James Murray, New English Dictionary, 1897
Dern
Of persons, proceeding in secret or in the dark; kept concealed; hence of evil or deceitful nature. Of persons, secret in purpose or action; reserved; hence, underhanded. sly, crafty. Of a person, treated as a confidant; entrusted with hidden matters. Of places, serving well to conceal, as lying out of the way.