- uncurbed (adj.)
- 1590s, from un- (1) "not" + past participle of curb (v.).
- undeviating (adj.)
- 1732, from un- (1) "not" + present participle of deviate (v.).
- undivulged (adj.)
- c. 1600, from un- (1) "not" + past participle of divulge (v.).
- undreamed (adj.)
- 1610s, from un- (1) "not" + past participle of dream (v.).
- unexperienced (adj.)
- 1560s, from un- (1) "not" + past participle of experience (v.).
- unexplored (adj.)
- 1690s, from un- (1) "not" + past participle of explore (v.).
- unfelt (adj.)
- 1580s, from un- (1) "not" + past participle of feel (v.).
- unforced (adj.)
- 1590s, from un- (1) "not" + past participle of force (v.).
- unforgotten (adj.)
- 1670s, from un- (1) "not" + forgotten. Similar formation in German unvergessen.
- undetectable (adj.)
- 1789, from un- (1) "not" + detectable (see detect (v.)).
- filing (n.)
- 1712, verbal noun from file (v.1). Filing cabinet is from 1883.
- finger-board (n.)
- of a violin, etc., 1670s, from finger (n.) + board (n.1).
- flip-top (adj.)
- 1955, of product packaging, from flip (v.) + top (n.1).
- ear-plug (n.)
- also earplug, 1841, from ear (n.1) + plug (n.).
- ear-muff (n.)
- also earplug, 1859, from ear (n.1) + muff (n.).
- unelectable (adj.)
- also un-electable, 1962, from un- (1) "not" + electable.
- engird (v.)
- 1560s, from en- (1) "in" + gird (v.). Related: Engirt; engirded.
- enisle (v.)
- c. 1600, from en- (1) "in, into" + isle (n.).
- enrobe (v.)
- 1590s, from en- (1) "in" + robe (n.). Related: Enrobed; enrobing.
- estuarine (adj.)
- 1835, from estuary on model of marine (adj.); see -ine (1).
- water-ice (n.)
- "sugared water, flavored and frozen," 1818, from water (n.1) + ice (n.).
- watercourse (n.)
- also water-course, c. 1500, from water (n.1) + course (n.).
- water-table (n.)
- "level of saturated ground," 1879, from water (n.1) + table (n.).
- well-founded (adj.)
- late 14c., from well (adv.) + past participle of found (v.1).
- inexpungible (adj.)
- 1610s, from in- (1) "not, opposite of" + expungible (see expunge).
- inextirpable (adj.)
- 1620s, from in- (1) "not, opposite of" + extirpable (see extirpate).
- insociability (n.)
- 1740, from insociable "unsociable" (1580s), from in- (1) "not, opposite of" + sociable.
- interterritorial (adj.)
- also inter-territorial, 1827, from inter- "between" + territory + -al (1).
- intranslatable (adj.)
- 1680s, from in- (1) "not, opposite of" + translate + -able. Related: Itranslatably; intranslatability.
- intra-orbital (adj.)
- also intraorbital, 1836, from intra- "within" + orbit (n.) + -al (1).
- intranslatable (adj.)
- 1680s, from in- (1) "not, opposite of" + translate + -able. Related: Itranslatably; intranslatability.
- intransmissible (adj.)
- 1650s, from in- (1) "not, opposite of" + transmissible. Related: Intransmissibly; intransmissibility.
- iron-bound (adj.)
- late 14c., from iron (n.) + bound (adj.1). Figurative use from 1807.
- irrecognition (n.)
- 1820, from assimilated form of in- (1) "not, opposite of" + recognition.
- irresistance (n.)
- 1640s, from assimilated form of in- "not, opposite of" (see in- (1)) + resistance.
- islander (n.)
- "native or inhabitant of an island," 1540s, from island (n.) + -er (1).
- jet (v.2)
- "travel by jet," 1946, from jet (n.1). Related: Jetted; jetting.
- imperception (n.)
- "want of perception," 1620s, from assimilated form of in- (1) "not, opposite of" + perception.
- imperceptive (adj.)
- "not perceiving," 1660s, from assimilated form of in- (1) "not, opposite of" + perceptive.
- imperturbed (adj.)
- 1721, from assimilated form of in- (1) "not" + perturbed. Related: Imperturbedly.
- impersuasible (adj.)
- 1570s, from assimilated form of in- (1) "not, opposite of" + persuasible (see persuadable).
- inconvertible (adj.)
- 1640s, from in- (1) "not, opposite of" + convertible (adj.). Related: Inconvertibly.
- indeterminism (n.)
- 1874 in philosophy, from in- (1) "not, opposite of" + determinism.
- ineconomy (n.)
- "waste of resources," 1881, from in- (1) "not, opposite of" + economy (n.).
- inefficiency (n.)
- 1749; see in- (1) "not, opposite of" + efficiency (n.).
- honeypot (n.)
- also honey-pot, late 15c., from honey (n.) + pot (n.1).
- hoof-mark (n.)
- also hoofmark, 1812, from hoof (n.) + mark (n.1).
- hop (v.2)
- "treat with hops," 1570s (implied in hopped), from hop (n.1).
- gum-drop (n.)
- also gumdrop, type of confection, 1856, from gum (n.1) + drop (n.).
- junkman (n.)
- "dealer in junk," 1872, from junk (n.1) + man (n.).
