Something or someone that never changes, that stays the course, and that is more like a rock than a leaf blowing in the wind shows constancy.

Have you ever noticed how some people change their minds every day? Someone like that isn't showing constancy. In parts of the world where the weather changes frequently, the weather has no constancy, whereas in San Francisco, where it's about 70 and mild for ten months of the year, the weather has constancy. If you take constancy — a good thing — too far, you have stubbornness — an undesirable quality.

Definitions of constancy
  1. noun
    the quality of being enduring and free from change or variation
    “early mariners relied on the constancy of the trade winds”
    synonyms: stability
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    changefulness, inconstancy
    the quality of being changeable and variable
    the nature of a quantity or property or function that remains unchanged when a given transformation is applied to it
    the quality of a physical system that persists in its existing equilibrium when undisturbed (or only slightly disturbed) but able to pass to a more stable equilibrium when sufficiently disturbed
    constancy of tone or pitch or inflection
    type of:
    changelessness, unchangeability, unchangeableness, unchangingness
    the quality of being unchangeable; having a marked tendency to remain unchanged
  2. noun
    faithfulness and dependability in personal attachments (especially sexual fidelity)
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    type of:
    faithfulness, fidelity
    the quality of being faithful
  3. noun
    (psychology) the tendency for perceived objects to give rise to very similar perceptual experiences in spite of wide variations in the conditions of observation
    synonyms: perceptual constancy
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    show 4 types...
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    brightness constancy
    the tendency for a visual object to be perceived as having the same brightness under widely different conditions of illumination
    color constancy, colour constancy
    the tendency for a color to look the same under widely different viewing conditions
    shape constancy
    the tendency to perceive the shape of a rigid object as constant despite differences in the viewing angle (and consequent differences in the shape of the pattern projected on the retina of the eye)
    size constancy
    the tendency to perceive the veridical size of a familiar object despite differences in their distance (and consequent differences in the size of the pattern projected on the retina of the eye)
    type of:
    the process of perceiving
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