Convenient; useful; handy — things that are convenient and frequently useful.
この折りたたみ傘は軽くて重宝だ。
This folding umbrella is light and handy.
小さな工具箱は家に一つあると重宝する。
A small toolbox is handy to have at home.
スマホは旅行中にとても重宝した。
The smartphone proved very useful during the trip.
To find something useful; to come in handy — often expressed as 重宝する (to be useful or frequently used).
古いタオルは掃除に重宝するので捨てないでおこう。
Old towels are handy for cleaning, so let's not throw them away.
この翻訳ツールは出張先で重宝するだろう。
This translation tool will probably come in handy on business trips.
彼の知識はチームで重宝されている。
His knowledge is valued and used by the team.
(Literary) A (precious) treasure — something of great value or treasured possession.
その古い本は家族にとっての重宝だ。
That old book is a treasured item for the family.
祖父の形見の時計は私にとっての重宝である。
My grandfather's watch is a treasured keepsake for me.
古文書は博物館にとっての重宝として保管されている。
The ancient documents are kept as treasures by the museum.