Showing signs of stress or strain; not relaxed.
Pulled taut, without any slack.
To apply a tense to.
To make tense.
To become tense.
Any of the forms of a verb which distinguish when an action or state of being occurs or exists.
The property of indicating the point in time at which an action or state of being occurs or exists.
An inflected form of a verb that indicates tense.
Not stable.
Readily decomposable.
Radioactive, especially with a short half-life.
Unpredictable.
Fickle.
Having a strong tendency to change.
Fluctuating; not constant.
To release (an animal) from a stable.