Level 15
Level 16

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immiscible
adj. Separating, as oil and water.
immortalize
v. To cause to last or to be known or remembered throughout a great or indefinite length of time.
immovable
adj. Steadfast.
impair
v. To cause to become less or worse.
impalpable
adj. Imperceptible to the touch.
impassable
adj. That can not be passed through or over.
impassible
adj. Not moved or affected by feeling.
impassive
adj. Unmoved by or not exhibiting feeling.
impecunious
adj. Having no money.
impede
v. To be an obstacle or to place obstacles in the way of.
impel
v. To drive or urge forward.
impend
v. To be imminent.
imperceptible
adj. Indiscernible.
imperil
v. To endanger.
impermissible
adj. Not permissible.
impertinence
n. Rudeness.
imperturbable
adj. Calm.
impetuosity
n. Rashness.
impetus
n. Any impulse or incentive.
impiety
n. Irreverence toward God.
impious
adj. Characterized by irreverence or irreligion.
impolitic
adj. Inexpedient.
importation
n. The act or practice of bringing from one country into another.
importunate
adj. Urgent in character, request, or demand.
importune
v. To harass with persistent demands or entreaties.
impoverish
v. To make indigent or poor.
impracticable
adj. Not feasible.
improvident
adj. Lacking foresight or thrift.
impugn
v. To assail with arguments, insinuations, or accusations.
impulsion
n. Impetus.
impute
v. To attribute.
inadvertent
adj. Accidental.
inadvisable
adj. Unadvisable.
inapt
adj. Awkward or slow.
inaudible
adj. That can not be heard.
inborn
adj. Implanted by nature.
incandescence
n. The state of being white or glowing with heat.
incandescent
adj. White or glowing with heat.
incapacity
n. Want of power to apprehend, understand, and manage.
inceptive
adj. Beginning.
inchoate
adj. Incipient.
incipient
adj. Initial.
incisor
n. A front or cutting tooth.
incitement
n. That which moves to action, or serves as an incentive or stimulus.
incoherence
n. Want of connection, or agreement, as of parts or ideas in thought, speech, etc.
incombustible
adj. That can not be burned.
incompressible
adj. Resisting all attempts to reduce volume by pressure.
incongruous
adj. Unsuitable for the time, place, or occasion.
inconsiderable
adj. Small in quantity or importance.
inconstant
adj. Changeable.
indelible
adj. That can not be blotted out, effaced, destroyed, or removed.
indigence
n. Poverty.
indigent
adj. Poor.
indigestible
adj. Not digestible, or difficult to digest.
indiscernible
adj. Not perceptible.
indiscriminate
adj. Promiscuous.
indistinct
adj. Vague.
indivisible
adj. Not separable into parts.
indolence
n. Laziness.
indolent
adj. Habitually inactive or idle.
indomitable
adj. Unconquerable.
induct
v. To bring in.
inebriate
v. To intoxicate.
ineffable
adj. Unutterable.
inefficiency
n. That which does not accomplish an intended purpose.
inert
adj. Inanimate.
inestimable
adj. Above price.
inexhaustible
adj. So large or furnishing so great a supply as not to be emptied, wasted, or spent.
inexorable
adj. Unrelenting.
inexpedient
adj. Unadvisable.
inexpressible
adj. Unutterable.
infest
v. To be present in such numbers as to be a source of annoyance, trouble, or danger.
infidel
n. One who denies the existence of God.
infirm
adj. Lacking in bodily or mental strength.
infirmity
n. A physical, mental, or moral weakness or flaw.
inflammable
adj. Easily set on fire or excited.
infrequent
adj. Uncommon.
infuse
v. To instill, introduce, or inculcate, as principles or qualities.
ingenuous
adj. Candid, frank, or open in character or quality.
inglorious
adj. Shameful.
ingratiate
v. To win confidence or good graces for oneself.
inhibit
v. To hold back or in.
inhospitable
adj. Not disposed to entertain strangers gratuitously.
inhume
v. To place in the earth, as a dead body.
inimical
adj. Adverse.
iniquity
n. Gross wrong or injustice.
inlet
n. A small body of water leading into a larger.
inmost
adj. Deepest within.
innovate
v. To introduce or strive to introduce new things.
inoffensive
adj. Causing nothing displeasing or disturbing.
inscribe
v. To enter in a book, or on a list, roll, or document, by writing.
insensible
adj. Imperceptible.
insentient
adj. Lacking the power of feeling or perceiving.
insignificance
n. Lack of import or of importance.
insufficiency
n. Inadequacy.
insular
adj. Pertaining to an island.
insulate
v. To place in a detached state or situation.
insuperable
adj. Invincible.
insurgence
n. Uprising.
insurgent
n. One who takes part in forcible opposition to the constituted authorities of a place.
Level 17