if we divide this into three parts...in+grain+ed....we see that middle part...grain....which is the seed of a food plant,,,and we know that food plant is always deeply rooted in the soil before it matures and devlop seeds.
like wise ingrained habits are also deeply rootedand its difficult to change them untill strict action is not taken.
GRAIN-sowed deep IN the soil,completely so-deep rooted
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