Acting with or showing good sense; able to make good judgements based on reason, or reflecting such ability.
Able to be sensed by the senses or the psyche; able to be perceived.
Characterized more by usefulness, practicality, or comfort than by attractiveness, formality, or fashionableness, especially of clothing.
Having a strong tendency to change.
Readily decomposable.
Not stable.
Radioactive, especially with a short half-life.
Unpredictable.
Fickle.
Fluctuating; not constant.
To release (an animal) from a stable.