Spendthrift is an antonym of tightwad.
As nouns the difference between spendthrift and tightwad
is that spendthrift is while tightwad is one who is stingy or overly cautious or defensive with money (usually mildly derisive).
spendthrift
English
Noun
(
en noun)
Someone who spends money improvidently or wastefully.
Synonyms
* See also
Derived terms
* spendthrift trust
Adjective
(
en adjective)
Wasteful, improvident or profligate.
Lavish or extravagant.
tightwad
English
Noun
(
en noun)
One who is stingy or overly cautious or defensive with money (usually mildly derisive).
- That tightwad would walk ten miles to save a few cents on gas.
Synonyms
* frugal
* miser
* skinflint
* See also
Antonyms
* spendthrift