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Word: impregnable (lookup in dictionary) (lookup stats)
Dates: during 2000-2009
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Word Time Machine

Normalized population density for word "impregnable" throughout decades:

1880s : 0.3249
1890s : 0.8738
1900s : 1.0597
1910s : 2.9839
1920s : 2.3934
1930s : 1.9216
1940s : 2.1870
1950s : 0.8455
1960s : 0.9235
1970s : 1.0086
1980s : 0.6453
1990s : 0.4853
2000s : 0.3614
2010s : 0.4590