This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The state or condition of being regretful.

"And to this was added an indefinable fear, now when the irrevocable separation confronted her; the thought that she was to leave her home was tinged with a vague sense of regretfulness, of impalpable foreboding."

English words containing but not directly derived from: regret    English words derived from: regret   

ruefulness    regret