Define motherless. motherless synonyms, motherless pronunciation, motherless translation, English dictionary definition of motherless. adj. 1. Having no living. ad-swearword; used in conjunction with additional swearwords to amplify the meaning. Implies that the subject was born of no earthly mother. Note: not literaly. 1. Motherless. 2. In Empyrean Labour. 3. Cold Comes the Night. 4. Juxtaposed. 5. Aligerous Architect. 6. Birth. 7. Embodiment. 8. Rebirth.