Spirits and stars · Neutral, leaning strong
Day pillars Geng-Chen, Geng-Xu, Ren-Chen and Wu-Xu: hard, sharp-minded and unwilling to be managed.
Read from the day pillar: Geng-Chen, Geng-Xu, Ren-Chen and Wu-Xu. The day pillar is the main reading; the hour pillar is also considered.
Source: San Ming Tong Hui, spirits and stars chapter
In practice it reads as having your own views, sticking to your reasoning, and being able to carry hard things. It suits situations that need a stiff spine; watch that stubbornness is not mistaken for principle.
Used: it is used as a personality signal in chart conclusions.
Rule of thumb: these markers are read from fixed classical tables, and the scores and advice come from a separate model. Both are laid out on the site, and neither is a claim about what will happen.
Does it always mean a temper?
Not always. The tradition says the nature is hard; how it shows depends on whether the structure checks it.
Is it bad for women?
The old reading carries the bias of its time. We read structure, not gender.