harden

As nouns the difference between keen and harden

is that keen is a prolonged wail for a deceased person while harden is .

As an adjective keen

is showing a quick and ardent willingness or responsiveness, enthusiastic, eager; interested, intense.

As a verb keen

is (rare) to sharpen; to make cold or keen can be to utter a keen.

Sustain is a related term of harden.

As nouns the difference between sustain and harden

is that sustain is (music) a mechanism which can be used to hold a note, as the right pedal on a piano while harden is .

As a verb sustain

is to maintain, or keep in existence.

Harden is a related term of jell.

As nouns the difference between harden and jell

is that harden is while jell is a jelly or gel.

As a verb jell is

to gel.

Harden is a related term of clot.

As a noun harden

is .

As a verb clot is

.

In intransitive terms the difference between harden and thicken

is that harden is to become hard (tough, resistant to pressure) while thicken is to become thicker (in the sense of more viscous).

In intransitive terms the difference between harden and set

is that harden is to become hard (tough, resistant to pressure) while set is of a heavenly body, to disappear below the horizon of a planet, etc, as the latter rotates.

In transitive dated terms the difference between harden and set

is that harden is to become or make a person or thing resistant or less sensitive while set is to cause to stop or stick; to obstruct; to fasten to a spot.

As a noun set is

a punch for setting nails in wood.

As an adjective set is

fixed in position.

As a proper noun Set is

an ancient Egyptian god, variously described as the god of chaos, the god of thunder and storms, or the god of destruction.

Harden is a related term of coagulate.

As nouns the difference between harden and coagulate

is that harden is while coagulate is a mass formed by means of coagulation.

As a verb coagulate is

to become congealed; to convert from a liquid to a semisolid mass.

As an adjective coagulate is

(obsolete) coagulated.

In intransitive terms the difference between strengthen and harden

is that strengthen is to grow strong or stronger while harden is to become hard (tough, resistant to pressure).

As verbs the difference between strengthen and harden

is that strengthen is to make strong or stronger; to add strength to; to increase the strength of; to fortify; to reinforce while harden is to become hard (tough, resistant to pressure).

Brace is a related term of harden.

As nouns the difference between brace and harden

is that brace is (obsolete) armor for the arm; vambrace while harden is .

As a verb brace

is (intransitive) to prepare for something bad, as an impact or blow.

As a verb inure

is to cause (someone) to become accustomed (to something); to habituate.

As a noun harden is

.