• WordNet 3.6
    • adj plummy (of a voice) affectedly mellow and rich "the radio announcer's plummy voice"
    • adj plummy very desirable "a plummy leading role"
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Webster's Revised Unabridged Dictionary
    • a Plummy Of the nature of a plum; desirable; profitable; advantageous. "For the sake of getting something plummy ."
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Century Dictionary and Cyclopedia
    • plummy Full of plums or excellences; hence, good; desirable.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Plummy full of plums: desirable
    • ***


Webster's Revised Unabridged Dictionary
From Plum
Chambers's Twentieth Century Dictionary
A.S. plúme—L. prunum—Gr. prounon.


In literature:

That cake's awful nice and plummy.
"Anne Of Avonlea" by Lucy Maud Montgomery
A warm plummy odor filled the whole house, for Priscilla was cooking in the kitchen.
"Anne Of The Island" by Lucy Maud Montgomery
So I tried to make it just like hers, and I do hope it will prove a good, sweet, plummy one.
"An Old-fashioned Girl" by Louisa May Alcott
Your mouth looks pretty plummy.
"Stalky & Co." by Rudyard Kipling
And besides we are going to give her half of that big plummy fruit cake Mother sent us from home.
"Lucy Maud Montgomery Short Stories, 1896 to 1901" by Lucy Maud Montgomery
But never mind, girls, I've a plummy bit of news for you.
"Lucy Maud Montgomery Short Stories, 1905 to 1906" by Lucy Maud Montgomery
But it is easy to overdo the plummy tone, which is apt to become cloying.
"Punch, or the London Charivari, Volume 147, August 12, 1914" by Various

In news:

Plummy thoughts on the red fruit.
The toys make it to the Sunnyside Day Care Center, where they meet new toys , such as bizarro Big Baby, ditzy triceratops Trixie (Kristen Schaal) and Shakespeare-spouting hedgehog Mr Pricklepants (a plummy Timothy Dalton).