| hopelessness | (noun) the despair you feel when you have abandoned hope of comfort or success | - |
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| propellant | (noun) any substance that propels | Synonyms: propellent |
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| propellent | (noun) any substance that propels | Synonyms: propellant |
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| propeller | (noun) a mechanical device that rotates to push against air or water | Synonyms: propellor |
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| propellor | (noun) a mechanical device that rotates to push against air or water | Synonyms: propeller |
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| sapropel | (noun) sludge (rich in organic matter) that accumulates at the bottom of lakes or oceans | - |
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