This word is acceptable for play in the UK dictionary that is being used in the following games:

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adj. (of a potted plant) grown too large for its container resulting in matting or tangling of the roots

adj. having the roots matted or densely tangled

"They looked like chrysanthemums, bedraggled, rootbound, and probably frozen now."

planted    tangled   

outbound    rebound    rockhound    rotund    softbound