0 changing suddenly and often:
a mercurial temperament
She was entertaining but unpredictable, with mercurial mood swings.
1 containing or caused by mercury:
mercurial drugs
The music is mercurial, humorous and very clever.
He undertakes a series of mercurial performances or ontological aberrations, stepping in and out of identities.
Its mercurial changes of mood, wistful humour and spontaneity make it ideally accessible, and it is not at all tiring.
Molecular cloning of a mercurial-insensitive water channel expressed in selected water-transporting tissues.
It conserved the sense of adventure, of discovery, of the vicissitudes of an artist who is perpetually restless, bellicose, with a mercurial temperament and the destiny of a martyr.
Medical knowledge of the time did not discriminate gonorrhea from syphilis, and consequently mercurial compounds were prescribed for both diseases, administered orally, cutaneously, or via urethral irrigation.
If they were less mercurial and more predictable many of us might be much more prosperous than we are.
His gentle encouragement and mercurial smile gave me much support in my sustained campaign to regain the seat.