volatile
/ˈvɑ.lə.təl/ adjective C1- Evaporating or vaporizing readily under normal conditions.
- Of a substance, explosive.
- Of a price, variable or erratic.
- Of a person, quick to become angry or violent. · a volatile man
- Fickle.
- Temporary or ephemeral.
- Of a situation potentially violent.
- Of a variable etc., having its associated memory immediately updated with any changes in value.
From the library
He could distinguish amid the perfumes of the roses and heliotropes in the flower-stands, the sharp and fragrant odor of volatile salts, and he noticed in one of the chased cups on the mantle-piece the countess’s smelling-bottle, taken from its shagreen case, and exclaimed in a tone of uneasiness, as he entered:
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