American Heritage Dictionary
(1)
Century Dictionary
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GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
Ther Martin boys an' ther Copelands an' others beside 'em, 'lows thet they ain't seekin' no heedless trouble and hit's more heedful-like fer 'em ter go on home an' avoid an affray.— A Pagan of the Hills
Perhaps she believed, with Mrs. Stidger, that the balsamic odors of the firs "did her chest good," for certainly her slight cough was less frequent and her step was firmer; perhaps she had learned the unending lesson which the patient pines are never weary of repeating to heedful or listless ears.— Short Story Classics (American) Vol. 2
[7] [8]"Ungentle, not heedful is this, Fergus my master!— The Ancient Irish Epic Tale Táin Bó Cúalnge
They are all heedful, observant of religious rites and excellent vows, and truthful in speech.— The Mahabharata of Krishna-Dwaipayana Vyasa, Volume 3 Books 8, 9, 10, 11 and 12
[360] A king that is heedful, by properly attending to the requirements of war and peace, succeeds in slaying even such foes as are eminent for wealth, worshipped for intelligence and good conduct, possessed of accomplishments, brave in battle, and ready for exertion.— The Mahabharata of Krishna-Dwaipayana Vyasa, Volume 3 Books 8, 9, 10, 11 and 12

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a year.
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