The phrase "fragile constitution" is correct and usable in written English.
It can be used to describe a physical or metaphorical state of being weak or easily affected, often in reference to health or stability.
Example: "Due to her fragile constitution, she had to be careful about the activities she engaged in."
Alternatives: "delicate constitution" or "weak constitution."
Wilson's always fragile constitution began to break down.
Powerful telescopes are behemoths with a fragile constitution.
Like Norman, he had a fragile constitution and took long periods of convalescence at key moments in the drama.
It would be a fragile Constitution indeed if subsequent amendments could, without express reference, be interpreted to wipe out the original understanding of congressional power.
He served in World War I for a short time as a truck driver at the front, but the strain was too great for his fragile constitution, and he was discharged from the army in 1917.
She had a fragile constitution, suffering from chronic migraines, lung ailments, and a vaginal discharge recorded for posterity in a malicious quatrain disseminated by the evil Comte de Maurepas.
Is our Constitution that fragile?
A new constitution cemented a (fragile) political stability, and output growth picked up to 5.6% in 2010, faster than the region's average.
As Myanmar's military government prepares to adopt a new and disputed Constitution next year, a fragile patchwork of cease-fire agreements between the central government and more than a dozen armed ethnic groups is fraying.
With every passing day, the casualties are mounting -- not just the innocent women and children abroad blown to smithereens by American missiles, but our Constitution, our increasingly fragile republic and our ability to trust that our government leaders will be accountable to abiding by the rule of law.
Our analysis of the constitutional life cycle leads us to think of constitutions as rather fragile organisms.
