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

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adj. Lacking energy or disinclined to exert effort; lethargic: reacted to the latest crisis with listless resignation.

adj. Lacking energy, enthusiasm, or liveliness.

adj. Having no desire or inclination; indifferent; heedless; spiritless.

Indifferent to or taking no interest in what happens about one; languid and unheeding: as, a listless hearer or spectator.

Marked by languid inactivity; manifesting relaxed attention; inanimate: as, a listless attitude.

Synonyms Listless, Careless, Supine, Indolent. The listless and the careless do not care or desire; the supine and the indolent do not care enough to conquer their shrinking from activity or work. The words may all indicate a temporary state or a permanent element of character; indolent generally indicates the latter. (See idle.) Careless is not caring; supine is literally lying flat on one's back, not rousing one's self at all, ignobly indifferent; listless, indifferent and languid. Listless does not necessarily imply blame.

adj. marked by low spirits; showing no enthusiasm

adj. lacking zest or vivacity

"After some days spent in listless indolence, during which I traversed many leagues,"

spiritless    lethargic    unenrgetic   

listlessly    listlessness   

uninterested    vacant    careless    languid    indolent    supine    indifferent    heedless    spiritless    apathetic   

languid    dejected    apathetic    indolent    sluggish    sullen    torpid    pensive    lethargic    sleepy