Steadiest

adjective

1. Firm in standing or position; not tottering or shaking; fixed; firm.

   "Hold the ladder steady while I go up."

2. Constant in feeling, purpose, or pursuit; not fickle, changeable, or wavering; not easily moved or persuaded to alter a purpose; resolute.

   "a man steady in his principles, in his purpose, or in the pursuit of an object"

3. Smooth and not bumpy or with obstructions.

   "a steady ride"

4. Regular and even.

   "the steady course of the Sun;  a steady breeze of wind"

5. Slow.