Source : Webster's Revised Unabridged Dictionary (1913)

Equable \E"qua*ble\ (?; 277), a. [L. aequabilis, fr. aequare to
   make level or equal, fr. 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 plain or globe.

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

Source : WordNet®

equable
     adj 1: not varying; "an equable climate"
     2: not easily irritated; "an equable temper"; "not everyone
        shared his placid temperament"; "remained placid despite
        the repeated delays" [syn: {even-tempered}, {good-tempered},
         {placid}]