Intelligent. Latin intelligens, to recognize, understand, discern; smart, talented, capable; think abstractly, use reason, then act.
Clever. From English clever. Intelligent, tactical; flexible, adaptable; to recognize all available options.
Smartphone. An English term quickly adopted by the German people because it so succinctly describes the product. There is no German equivalent.
Mitdenken. Literally think with. To think independently, to anticipate; thoughtful, reflective.