Etymology
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inefficiency (n.)

1749; see in- (1) "not, opposite of" + efficiency (n.).

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inapprehensible (adj.)

"not intelligible," 1640s, from in- (1) "not, opposite of" + apprehensible.

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incohesion (n.)

1781; see in- (1) "not, opposite of" + cohesion.

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inoperative (adj.)

"not working," 1630s, from in- (1) "not, opposite of" + operative (adj.).

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inconducive (adj.)

1729, from in- (1) "not, opposite of" + conducive.

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insobriety (n.)

1610s, from in- (1) "not, opposite of" + sobriety.

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