"however worrisome" is a correct and usable phrase in written English.
You can use it to express that something is worrying or causing concern. For example: The students had been studying for months, however worrisome, the results of the exam were not what they had hoped for.
As a result, concerns about what he may do, however worrisome, matter less than the larger question of where we go from here.
It is however, worrisome to think that we live so divided that a person in need, regardless of class, color, gender, sexual orientation, or age, cannot benefit from a reasonable response to crisis.
However, a worrisome result on the DAP not always indicates a worrisome result on the RAKIT or the M-ABC, so we advice a more profound neuropsychological examination in these cases before conclusions can be made.
The fundamentals, however, remain worrisome.
However, some worrisome complications do persist.
This could be worrisome (however needlessly) in a lip balm.
They were worrisome, however, he said, because the victims had not been young men.
What is worrisome, however, is the increasingly dissatisfied tone of the players in the locker room after the losses.
Xtandi has its own side effects, however, the most worrisome being seizures, which were suffered by about 1 percent of men taking it in the clinical trial.
Perhaps even more worrisome, however, is what the team found when it compared maps of intact savanna with lion population data and statistics on human population density and distribution.
What seems worrisome, however, is the reasoning behind the Administration's approach, which seems to be dictated primarily by concerns about reputation and by a negative logic we cannot not do something rather than by an attempt to articulate what it actually hopes to accomplish in making a military strike.
