eq·ua·ble 
(ĕkwə-bəl, ēkwə-)
(ĕkwə-bəl, ēkwə-)adj.
1. Unvarying; steady: "In the equable equatorial zone there is no such struggle against the climate" (David Campbell).
2. Not easily disturbed; serene: an equable temper.
[Latin aequābilis, from aequāre, to make even, from aequus, even, level.]
eq′ua·bili·ty, equa·ble·ness n.
equa·bly adv.