wastrel

As an adjective decadent

is decadent.

As a noun wastrel is

(dated) one who is profligate, who wastes time or resources extravagantly.

Spender is a related term of wastrel.

As nouns the difference between spender and wastrel

is that spender is donor while wastrel is (dated) one who is profligate, who wastes time or resources extravagantly.

As a noun wastrel is

(dated) one who is profligate, who wastes time or resources extravagantly.

As nouns the difference between squanderer and wastrel

is that squanderer is agent noun of squander; one who squanders while wastrel is one who is profligate, who wastes time or resources extravagantly.

As an adjective pedantic

is like a pedant, overly concerned with formal rules and trivial points of learning.

As a noun wastrel is

(dated) one who is profligate, who wastes time or resources extravagantly.

As nouns the difference between wastrel and wastel

is that wastrel is one who is profligate, who wastes time or resources extravagantly while wastel is a kind of fine white bread or cake.

As nouns the difference between wastrel and spendthrift

is that wastrel is one who is profligate, who wastes time or resources extravagantly while spendthrift is someone who spends money improvidently or wastefully.

As an adjective spendthrift is

wasteful, improvident or profligate.

As nouns the difference between wastrel and castrel

is that wastrel is (dated) one who is profligate, who wastes time or resources extravagantly while castrel is .

As nouns the difference between wastrel and wastorel

is that wastrel is (dated) one who is profligate, who wastes time or resources extravagantly while wastorel is .

As nouns the difference between taxonomy and wastrel

is that taxonomy is the science or the technique used to make a classification while wastrel is (dated) one who is profligate, who wastes time or resources extravagantly.