Depending on the context it could mean that the persons mood changes unpredictably.
Innuendo
Organizing is best described
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he described algebra as a merry science
A detail design
If someone has a mercurial temperament, it means that person has sudden and rapid mood changes.
When a person is described as incoherent it means that they can't think or talk in a clear way. This might be because of a disability or because they're angry or excited.
Mercury or quicksilver is a liquid metal which runs all over the place when not contained (as in a thermometer) and is therefore difficult to control. Someone who is very quick to change moods or ideas etc. can be described as being mercurial.
Mercurial and mercury
He has mercurial temperment.
An antonyms of mercurial is unchanging.
Mercurial is mood swings: The mercurial patient had mood swings frequently.
Having the qualities fabled to belong to the god Mercury; swift; active; sprightly; fickle; volatile; changeable; as, a mercurial youth; a mercurial temperament., Having the form or image of Mercury; -- applied to ancient guideposts., Of or pertaining to Mercury as the god of trade; hence, money-making; crafty., Of or pertaining to, or containing, mercury; as, mercurial preparations, barometer. See Mercury, 2., Caused by the use of mercury; as, mercurial sore mouth., A person having mercurial qualities., A preparation containing mercury.
We bought a mercurial barometer to help predict the weather.Her mercurial temperment made her an exciting actress to watch.It is hard to find a mercurial thermometer any more.
Mercurial was created on 2005-04-19.
Mercurial Manoeuvres was created in 2000.
The boys anger was mercurial I had to tackle him down.