INSOUCIANT
(\in-SOO-see-uhnt\ , adjective):
1. Marked by lighthearted unconcern or indifference; carefree; nonchalant.
Origin:
Insouciant is from the French, from in-, "not" + souciant, "caring," present participle of soucier, "to trouble," from Latin sollicitare, "to disturb," from sollicitus, "anxious." The noun form is insouciance.
My sentence:
The City Council provided each corner of the street garbage bins for rubbish, but insouciant passers by are too lazy to use them; instead, they throw their wastes over the fence of a vacant lot nearby.
Source: Dictionary
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