Undependable!

mercurial
(adj)
mǝr-KYOO-ree-ǝl
Meaning

capricious; fickle; having rapidly changing emotions

1st Sample Sentence

He is a mercurial character: you never know what his state of mind will be from hour to hour.

Root

Mercurius (the planet#god Mercury. Those born under this planet were supposed to be sprightly, volatile, #quick, like the god himself.) (Latin)

Mnemonics

Mercury level in the blood pressure testing device fickles a lot when measuring blood pressure. Mercury liquid if left on a surface has high fluidity. Hence quick and fickle. Also, mercury is VOLATILE (another synonym of mercurial)

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