Definition from: http://www.thefreedictionary.com/covetousness
Noun 1. covetousness - an envious eagerness to possess something
enviousness, envy - a feeling of grudging admiration and desire to have something that is possessed by another
2. covetousness - extreme greed for material wealth
avariciousness, cupidity, avarice
greed - excessive desire to acquire or possess more (especially more material wealth) than one needs or deserves
3. covetousness - reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins)
avarice, avaritia, greed, rapacity
deadly sin, mortal sin - an unpardonable sin entailing a total loss of grace; "theologians list seven mortal sins"
SEE ALSO COLOSSIANS 3:5 which states covetousness is the same as idolatry.