"serious advice" is correct and usable in written English.
You can use it when you are seeking advice that is important or critical. For example, "I need some serious advice about how to handle this situation."
The second, less serious, advice would be: don't automatically disdain mate, the gauchos' drink of choice.
"He's hilariously funny, but the first person you would call for serious advice".
It's also about failed relationships and self-esteem, with dancing, stripping, crowd-surfing and serious advice about depression.
When mere boosterism is mistaken for serious advice, people of a different mind are dismissed as Neo-Luddites.
My serious advice to the Fawcett Society, as it prepares for its day of action in Westminster and around the UK on 19 November?
(We consider carefully Mark Twain's half-serious advice: "When you catch an adjective, kill it").
(We consider carefully Mark Twain's half-serious advice: "When you catch an adjective, kill it"). Students allow themselves to be bold, to be bracing to sharpen their font edges.
To get good advice on serious mental illness, Obama should turn to the real experts: police and others in the criminal-justice system.
Pantalone was a Venetian merchant: serious, rarely consciously comic, and prone to long tirades and good advice.
It means serious information, advice and guidance.
