The slant of letters, as opposed to, for example, their size, is a changing aspect. It depends not only on psychological qualities of a person in general, but on his temporary emotional state, too.
That’s why this factor should be used with caution, and it’s better not to make serious conclusions based on just a slant, which should always be considered in combination with other signs of handwriting. However, experienced graphologists always take into account the slant during analysis, because it can significantly complement the entire analysis.
At school, we are taught to write with a right slant, as it is considered to be the most convenient placement of letters for writing. Maybe that’s why a right slant is the most frequent type. However, a handwriting is very individual (otherwise we would all write similarly, like on worksheets) so there are also vertical and left slants. Apart from that, a degree of the slant makes a difference, too. And the more the degree is, the more expressed the qualities it means are.
A right slant in handwriting means emotional, impulsive, sensitive to emotional states of other people nature, and the larger the slant is, the less reserved the person is.
A left slant speaks about the introvert nature of the author, sometimes he finds it difficult to adapt to the changing world, so he prefers living in his own world. Such people tend to live secluded lives, live in the past and are scared of future. Cold and detached from the outside, these people are able to have strong inner feelings.
A vertical handwriting means that the person has a high level of self-control. But he still doesn’t live in seclusion, he is equally interested in outer and inner worlds. He is independent and most probably is not a team player. He’s a strong person and relies only on himself.
Interesting studies in slant were made by the German scientist William Preyer.
Studying his father’s letters, he analysed how the handwriting changed within just a few years of his life. Preyer’s father was a hot tempered man, emotional and sensitive, and the handwriting in his early letters showed exactly this person — with a distinct right slant. With years, the slant was changing to the vertical position, and you could see how the man was trying to suppress his feelings and emotions, like you are supposed to do in mature age.