What is the meaning of the word "stolidity"?

This characteristic can be perceived as a strength, indicating reliability and steadiness, but it might also be seen as a lack of sensitivity or emotional depth.

Definitions:

An absence of amotion or enthusiasm. NOUN
- Despite the harsh criticism, she maintained a sense of stolidity, not letting the negative comments affect her.
An indifference to pleasure or pain. NOUN
- Observers were surprised by his stolidity at the news of his unexpected victory, expecting a more emotional response.
Having or showing little or no sensibility or being unemotional. NOUN
- His stolidity in the face of danger reassured the others, keeping them calm and focused.