Meanings of developed unexpected in English

And now Rhodolph developed unexpected energy, mingled with treachery and disgraceful duplicity.

Well was it for France that Charles VII., as king, developed unexpected firmness and ability.

He developed unexpected aptitudes, became a marksman of big guns, showed resource and skill in boat-work, earned the repeated commendations of his superiors.

Latterly, since the erection of the mill, he had developed unexpected acumen in the disposal of the season's cut to wholesale dealers in Chicago.