Verb (used with object) : Dampness rots wood.    From Dictionary.com. 

Noun : the rot of an old house. ,the rot and waste of a swamp.    From Dictionary.com. 

Weathered and unpainted, though not dilapidated, the small barn stood straight on unrotted sills.    From Wordnik.com.  [The Death of James A. Garfield « A Fly in Amber] Reference

Here I thought it was just the lychees and rambutans unrotted, but I started hacking at the lumps with my spade and they broke down.    From Wordnik.com.  [My Compost's Heap pf Patience] Reference

It was once mistakenly believed that unraked lawn clippings built up on the ground as unrotted thatch, promoting harmful insects and diseases.    From Wordnik.com.  [Organic Gardener's Composting] Reference

This problem is usually associated with green unrotted manures or the use compost which has not completed the composting process as you stated.    From Wordnik.com.  [Is it safe to eat fish especially catfish from farm ponds that hold runoff from crop fields?] Reference

Green unrotted manures are not recommended for application to vegetable gardens because of naturally occuring disease pathogens such as lysteria which can cause devastating illness.    From Wordnik.com.  [Is it safe to eat fish especially catfish from farm ponds that hold runoff from crop fields?] Reference

By the time the material has reheated in bin four and cooled you will have finished or close-to-finished compost At any point during this turning that resistant, unrotted material is discovered, instead of passing it on, it may be thrown back to an earlier bin to go through yet another decomposition stage.    From Wordnik.com.  [Organic Gardener's Composting] Reference

CAUTION -- Do not use fresh or unrotted manure, as it encourages diseases of various kinds.    From Wordnik.com.  [From Captivity to Fame or The Life of George Washington Carver] Reference

But the Egyptian, with mental faculties unrotted by creedal fatuities like our own, would not so feed 'of the chameleon's dish,' -- needed something more than words, words, and words.    From Wordnik.com.  [The Crest-Wave of Evolution A Course of Lectures in History, Given to the Graduates' Class in the Raja-Yoga College, Point Loma, in the College-Year 1918-19] Reference

The juniper lands are composed of unrotted peat nearly pure, and of but a very small proportion of well-decomposed vegetable matter -- and that which is decomposed, before draining, is a black semi-fluid mire or sludge.    From Wordnik.com.  [Agricultural, Geological, and Descriptive Sketches of Lower North Carolina, and the Similar Adjacent Lands] Reference

When the trade winds didn't blow, sailors hand-tarred the ship's rigging, picked oakum (meaning they picked apart old rope for its unrotted fibers and then spun and braided new ropes using the fibers they reclaimed), mended their few clothes and swabbed the decks.    From Wordnik.com.  [The Vail Trail - All Sections] Reference

But the following rains had washed the exposed fibrous roots and made the few earthy particles sink or disappear -- so that the new surface as low beneath as my fingers could reach, seemed not less a mat of tough unrotted fine fibrous roots, than the former surface layer, was, where not burnt.    From Wordnik.com.  [Agricultural, Geological, and Descriptive Sketches of Lower North Carolina, and the Similar Adjacent Lands] Reference

This would seem to be the case on the great "Open Ground" savanna in Carteret country, North Carolina, (a body of nearly ninety thousand acres,) which lies high enough, but of which the soil contains less of earth, or even of reduced vegetable matter, compared to the unrotted and coarse, than any other peat or swamp soil that I have examined.    From Wordnik.com.  [Agricultural, Geological, and Descriptive Sketches of Lower North Carolina, and the Similar Adjacent Lands] Reference

Wherever there remained on the surface of the ditch-bank a sod of this layer, as cut and thrown out by the spade, and exposed to a year's rains, the finer parts were washed from the upper surface, the small fibrous roots, still unrotted, only were visible, and the whole lump, with its earthy parts and with still some remaining moisture below, was light enough to float in water like a cork.    From Wordnik.com.  [Agricultural, Geological, and Descriptive Sketches of Lower North Carolina, and the Similar Adjacent Lands] Reference

A compost pile do not get hot, tend to completely dry out, and fail to decompose, turning the pile also rotates the unrotted skin to the core and then insulates it with more-decomposed material taken from the center of the original pile.    From Wordnik.com.  [Organic Gardener's Composting] Reference

But the labor of excavating through a close and deep mat of living juniper stumps and roots, and the still lower stumps and roots and prostrate trunks of junipers of older growth, remaining unrotted beneath the earth -- and the excavation to be made in the softest of mire, or under water -- presented difficulties so enormous, that it was preferred to raise the level of the canal by embankments, and with two additional locks, to the present summit level.    From Wordnik.com.  [Agricultural, Geological, and Descriptive Sketches of Lower North Carolina, and the Similar Adjacent Lands] Reference

Of oak, or pine, unrotted by the rain.    From Wordnik.com.  [The Iliad] Reference

Page 129 line 24, for 'rotted' read unrotted.    From Wordnik.com.  [Agricultural, Geological, and Descriptive Sketches of Lower North Carolina, and the Similar Adjacent Lands] Reference

On the other hand, if, by virtue of our hotter and longer summers, a large proportion of the yearly deposit of vegetable matters, on peat swamp, pass speedily into putrefaction (and so make true food or manure for plants,) leaving unrotted and insoluble but a small proportion, to go to increase the true peat formation, then it will be plain enough why such land, when first drained and subjected to culture, should at first be extremely rich and productive, however defective such soils may be in other respects, and in later time.    From Wordnik.com.  [Agricultural, Geological, and Descriptive Sketches of Lower North Carolina, and the Similar Adjacent Lands] Reference