The phrase "a far less robust" is correct and usable in written English.
It can be used to compare the strength or effectiveness of something in a less favorable manner.
Example: "The new software is a far less robust solution than the previous version, leading to more frequent errors."
Alternatives: "significantly weaker" or "much less effective".
A boisterous child who developed into a quiet, calm young man, a gifted centre-forward in a far less robust, more inventive, style than his father's, long the fulcrum of the Forest attack, he later played with Liverpool and Manchester City.
There is a far less robust evidence base regarding the 'nonbiomedical' outcomes of treatment in Africa.
The most profound advantages of this "peak tracking chip" technique, to our eyes, rest with the self-calibrated aspect of our sensor, i.e., the fact that a whole scan through resonance implies a signal shape analysis rather than a far less robust signal value easily plagued by drifts.
The modern Internet is a digital superhighway built on top of a footpath, which was far less robust.
There is an abundance of other potential terrorist targets containing hazardous materials that pose a far greater risk and whose defenses are far less robust.
On the other hand, the reduction is far less robust than those who favor a more limited mission or complete pull-out want.
The Democratic super PAC donor world remains far less robust than the Republican one.
Fourth- and eighth-grade students in all ethnic groups showed improvement in math, it said, but progress in science is far less robust.
The meeting still showed the power of the United States to set the agenda for international discussion, even if the result — charging the International Monetary Fund with analyzing the sources and consequences of the imbalances — was far less robust than American officials had hoped for.
Prices have de-coupled from fundamentals, which appear far less robust than markets indicate.
Without the close relationship to Magic Leap that Weta enjoyed, the game from Wingnut's studio was far less robust, but no less enjoyable.
