알뜰해요 · 알뜰했어요 · 알뜰한 (+noun)
thrifty, frugal, economical
Example
제 언니는 알뜰해서 돈을 많이 모았어요.
My older sister is thrifty, so she has saved a lot of money.
Word parts
Doubled form 알뜰살뜰 means 'very thrifty and careful with the household'.
Good to know
A positive word for smart saving; 알뜰폰 = budget phone plan, 알뜰 시장 = flea market.