"mental fragility" is correct and usable in written English.
You can use it to describe a state of being vulnerable emotionally, or easily overwhelmed by stress. For example, "The pandemic has revealed the mental fragility of many in our community."
Yet the mental fragility was clear.
Kagawa can still show signs of mental fragility.
He had experienced periods of depression and mental fragility before.
This didn't happen, of course, but shows Lyle's mental fragility at the time.
Vanessa's anger and sense of betrayal is exacerbated rather than tempered by Virginia's mental fragility.
Women were no longer viewed as merely the victims or possessive maternal instigators of mental fragility.
Mr. Previn had begun an affair with the actress Mia Farrow, then in her early 20s, whom he later married, and Ms. Previn, who had a history of emotional fragility and mental illness, fell apart.
Although they are certainly very different composers who followed divergent paths, similarities abound: The music of each is full of whimsy and imagination, and their lives and careers were curtailed by fragility, Schumann's mental and Chopin's physical.
Seymour said: "We need to get out of our own way sometimes and not be the creators of our own downfall, however there is certainly no fragility on a mental aspect in terms of any of the players I go out and play with.
However, the elusiveness of clinical gains amongst many mental health service users, the fragility of these gains given the high rates of relapse and the reality that when gains are achieved they often require treatment over the long term, may be one key influence.
The plea brought a sudden resolution to a case that seemed threatened by the fragility of Mr. Loughner's mental state.
