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No, Contentious is not derived from content. It’s not its adjective. It’s not another noun with the same meaning. It’s a totally different word that has a totally different meaning.
Content [kuhn-tent] or Contented [kuhn-ten-tid] (adj.):
satisfied, contempt, agreeing.
You can’t bribe me with your money, I’m contented with my own.
Contentious [kuhn-ten-shuhs] (adj.):
1. argumentative, quarrelsome.
2. causing argument or strife.
When the issue became contentious, the negotiation had to be halted until both parties regained their composure.
Wroth [rawth, roth or, esp. British, rohth] (adj.):
2. stormy, violent, turbulent.
His wroth blurred his common sense. At that moment, he was ready to do anything.
This is another set of words I commonly confuse. Turns out, they are not only pronounced alike but they are, more or less, antonyms.
Emerge [ih-murj] (verb):
1. to come forth into view or notice.
2. to rise, as from difficulty.
3. to come into existence.
Little bubbles emerged on the surface of the water. “Someone’s down there,” he yelled, “and he’s breathing.”
Immerge [ih-murj] (verb):
1. to plunge, as into fluid.
2. to disappear by entering into a medium, as the moon into the shadow of the sun.
Having arrived at a dead end, Sergey caught his breath and immerged himself under the surface of the pond.