- not easily irritated
"an equable temper"
"not everyone shared his placid temperament"
"remained placid despite the repeated delays"

- not varying
"an equable climate"

1. Equal and uniform; continuing the same at different times; -- said of motion, and the like; uniform in surface; smooth; as, an equable plain or globe.

2. Uniform in action or intensity; not variable or changing; -- said of the feelings or temper.