Etymology
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incapable (adj.)

"not capable," 1590s, from French incapable (16c.) and directly from Medieval Latin incapabilis "incapable," from in- "not" (see in- (1)) + capabilis "receptive; able to grasp or hold" (see capable). Related: Incapably; incapability.

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unsurmountable (adj.)
"incapable of being overcome," 1701, from un- (1) "not" + surmountable.
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non-combustible (adj.)

also noncombustible, "incapable, of catching fire,"1804, from non- + combustible.

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impassible (adj.)
"incapable of feeling pain, exempt from suffering," mid-14c., from Old French impassible (13c.) or directly from Church Latin impassibilis "incapable of passion," from assimilated form of in- "not, opposite of" (see in- (1)) + passibilis "capable of passion, feeling, or suffering, from passio "suffering" (see passion). Meaning "emotionless" is from 1590s. Related: Impassibility.
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dauntless (adj.)

"bold, fearless, incapable of being daunted," 1590s, from daunt + -less. Related: Dauntlessly.

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flightless (adj.)
"incapable of flying," 1846, from flight (n.1) + -less. Related: Flightlessly; flightlessness.
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infallibility (n.)
"quality of being incapable of error," 1610s, from Medieval Latin infallibilitas, from infallibilis (see infallible).
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unlivable (adj.)
1834, "incapable of being lived in," from un- (1) "not" + livable.
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chimerical (adj.)

"pertaining to or of the nature of a chimera;" hence "incapable of realization, preposterous," 1630s, from chimera + -ical. Related: Chimeric (1650s).

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neuter (v.)

"castrate, render (a male) incapable of generation," 1893, in reference to dogs, from neuter (adj.). Related: Neutered; neutering.

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