1) An equable temperament 2) Not changing 3) Not easily irritated 4) Not varying 5) Steady 6) Temperate 7) Without variations 1) Even 2) Evenminded 3) Temperate 
smooth; without wide variations
• (a.) Uniform in action or intensity; not variable or changing; -- said of the feelings or temper. • (a.) 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.
E'qua·ble adjective [ Latin aequabilis , from aequare to make level or equal, from aequus even, equal. See Equal .] 1. Equal and uniform; continuing the same at different times; -- said of motion, and the like; uniform in surface; smooth; as, an equable plai...
steady regular 
[adj] - not varying 2. [adj] - not easily irritated
equable Of uniform condition or movement; steady; even; not readily disturbed.
even-tempered adjective not easily irritated; `an equable temper`; `not everyone shared his placid temperament`; `remained placid despite the repeated delays`
free from many changes or variations; uniform: an equable climate; an equable temperament. · uniform in operation or effect, as laws.
[ASVAB glossary] not varying not varying[Intelligent words] not varying