The word for today is…

mercurial (adjective):

1 : of, relating to, or born under the planet Mercury
2 : having qualities of eloquence, ingenuity, or thievishness attributed to the god Mercury or to the influence of the planet Mercury
3 : characterized by rapid and unpredictable changeableness of mood
4 : of, relating to, containing, or caused by mercury

Source : Merriam -Webster

Etymology : The Roman god Mercury was the messenger and herald of the gods and also the god of merchants and thieves (his counterpart in Greek mythology is Hermes). He was noted for his eloquence, swiftness, and cunning, and the Romans named what appeared to them to be the fastest-moving planet in his honor. Mercurial comes from the Latin adjective mercurialis, meaning “of or relating to Mercury.

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David is a retired surgeon originally from London who came to New Zealand twenty-seven years ago after being delayed in Singapore for thirteen years on leaving the UK. He was coerced into studying Latin...