Make a sentence with contumacious?

Presidents try their hardest but still make mistakes, which makes the people continue to antagonize them for being less than perfect.

crystallization usually takes a long time.

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The succulence of watermelons makes them very popular in summer! Many desert animals rely on the succulence of the Prickly Pear cactus as a source of water. A barrier of cactus could be referred to...

Here's two sentences : If something blocks your way, you can't get through.A block is a toy made out of wood or plastic that you can build with.