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Words getting along nicely ....

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Word: challenging (lookup in dictionary) (lookup stats)
Dates: during 1870-1879
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Word Time Machine

Normalized population density for word "challenging" throughout decades:

1870s : 0.5156
1880s : 0.2390
1890s : 0.0838
1900s : 0.0339
1910s : 0.0277
1920s : 0.2056
1930s : 0.3115
1940s : 0.2972
1950s : 0.5969
1960s : 0.7665
1970s : 0.9816
1980s : 1.2198
1990s : 1.3406
2000s : 1.9405
2010s : 2.7080