• WordNet 3.6
    • adj underhand marked by deception "achieved success in business only by underhand methods"
    • adj underhand with hand brought forward and up from below shoulder level "an underhand pitch","an underhand stroke"
    • adv underhand with the hand swung below shoulder level "throwing a ball underarm"
    • adv underhand slyly and secretly "Mean revenge, committed underhand"- John Donne","oldline aristocratic diplomats underhandedly undermined the attempt...to align Germany with the Western democracies"- C.G.Bowers"
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Webster's Revised Unabridged Dictionary
    • Underhand By secret means; in a clandestine manner; hence, by fraud; unfairly; dishonorably. "Such mean revenge, committed underhand .""Baillie Macwheeble provided Janet, underhand , with meal for their maintenance."
    • Underhand (Baseball, Cricket, etc) Done, as pitching, with the hand lower than the shoulder, or, as bowling, with the hand lower than the elbow.
    • Underhand (Baseball, Cricket, etc) In an underhand manner; thrown with the hand no higher than the shoulder and the palm turned upward during part of the pitch; -- said of pitching or bowling a ball.
    • Underhand Secret; clandestine; hence, mean; unfair; fraudulent.
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Century Dictionary and Cyclopedia
    • underhand By secret means; in a clandestine manner, and often with an evil design.
    • underhand By fraud; by fraudulent means.
    • underhand Secret; clandestine: usually implying meanness or fraud, or both.
    • underhand Sly; contriving; deceitful.
    • underhand Performed or done with the knuckles of the hand turned under, the palm upward, and the thumb turned from the body: as, underhand bowling in cricket.
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Chambers's Twentieth Century Dictionary
    • adj., adv Underhand un-dėr-hand′ secretly: by secret means: by fraud: in cricket, delivered with the hand underneath—opp. to Over-arm and Round-arm
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In literature:

It's one's duty to protest against mean, underhand actions.
"Etheldreda the Ready" by Mrs. George de Horne Vaizey
He refused to be a party to any political jobbery, any underhand business.
"Pushing to the Front" by Orison Swett Marden
There has been nothing underhanded.
"A Life's Eclipse" by George Manville Fenn
Don't insult my father by saying things in that underhanded way.
"Three Boys" by George Manville Fenn
I did not follow any such underhanded proceeding.
"The Atlantic Monthly, Volume 17, No. 102, April, 1866" by Various
And yet they were both noble boys, with nothing false or ungenerous or underhanded about either of them.
"Captain Mugford" by W.H.G. Kingston
I hate all these underhand things.
"The Youngest Girl in the Fifth" by Angela Brazil
Evil speakers, malicious, underhand hypocrites, have turned my father against me.
"Agatha's Husband A Novel" by Dinah Maria Craik (AKA: Dinah Maria Mulock)
I will not abet you, nor will I encourage any underhanded proceedings.
"The Old Stone House and Other Stories" by Anna Katharine Green
I want to know just how and where to help them best, but I hate to act in an underhanded way.
"Joyce's Investments" by Fannie E. Newberry
Justina, failing to intimidate, made various underhand attempts to remove the champion of orthodoxy.
"Historical Sketches, Volume I (of 3)" by John Henry Newman
I'd never be underhand about it.
"The Californians" by Gertrude Franklin Horn Atherton
Believe me, there is something underhanded about him.
"Modern Icelandic Plays" by Jóhann Sigurjónsson
It did seem a little underhand, this was all that troubled her.
"The Pleasant Street Partnership" by Mary F. Leonard
You are openly on our side now, Sir Ralph, so there can be no fear of your again being accused of acting in an underhand manner.
"The Grell Mystery" by Frank Froest
For if such were the case, Burke might have obtained, in some underhand manner, authority to dispose of it.
"The Paternoster Ruby" by Charles Edmonds Walk
Nothing underhand about Potts.
"Molly Bawn" by Margaret Wolfe Hamilton
It seems so ... so underhanded to be doing these things behind his back!
"The Winds of Time" by James H. Schmitz
Political chicanery was a name given to various underhand and dishonest maneuvers to gain office and public power.
"Mizora: A Prophecy" by Mary E. Bradley
In an underhand way he did a deal of business.
"The Opal Serpent" by Fergus Hume

In news:

Good ol' Mitt — pitch underhand to him and he still manages to strike out.
The only thing that comes to mind is Irish Whiskey lemonade, which is an underhanded way of getting everybody drinking Irish Whiskey Punch.
Each weekend, the story goes, young Amanda Williams threw a thousand underhand pitches to her father Steve in their Oakley backyard.
Rep Kurt Schrader calls alleged ballot tampering in Clackamas County 'sneaky, underhanded '.
Underhanded Orleans prosecutors' actions bar retrial, lawyers argue.
Dwight Howard needs to start shooting underhanded free throws.
But Magic big man would have to shoot underhanded .
Of course, in baseball's early days, all pitching was underhand .
Last month, I discussed the top six underhanded tactics used by husbands during divorce.
He was arrested and imprisoned in 1937 for using his pulpit for "underhand attacks on state and party".
Ever the gambler, he flipped a wobbly, underhanded pass that he had no business trying, let alone completing.
In my first major league game I caught Elden Auker, the old submarine pitcher with the underhand delivery.
The A's had runners on first and third with two out in a tie game Sunday when Cespedes grounded out to Alburquerque, who kissed the ball before he underhanded it to first base.
He removed the ball from his glove, gave it a little kiss , then made an underhand toss to Prince Fielder at first base to get the Tigers out of the threat.
This is In response to Allan Shores' offensive and underhanded remarks about Frank Gordon in the recent ads he has been running.