Etymology
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inconsideration (n.)

1520s, "indiscretion, rashness, failure to consider," from Late Latin inconsiderationem (nominative inconsideratio) "inconsiderateness," from Latin inconsideratus "headstrong, thoughtless" (see inconsiderate).

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Definitions of inconsideration

inconsideration (n.)
the quality of failing to be considerate of others;
Synonyms: inconsiderateness / thoughtlessness
From wordnet.princeton.edu