Formal:
* The dictator's regime used diabolically clever propaganda to maintain control over the population.
* The scientist's diabolically ingenious plan to create a synthetic life form was met with both awe and apprehension.
Informal:
* My cat is diabolically good at hiding things, I swear she's possessed by a mischievous sprite.
* I'm diabolically hungry, I could eat a horse right now.
Figurative/Humorous:
* The barista diabolically crafted a latte art that looked exactly like my boss's face, which I found both hilarious and slightly terrifying.
* The kids were diabolically excited about the upcoming trip to the amusement park, their energy levels bordering on supernatural.
Remember, "diabolically" implies something cunning, evil, or mischievous. Choose your sentence structure and context based on your intended meaning.