To constrain is to impose limitations or restrictions on someone or something, or to force yourself or someone else to act in a certain way.
(Economics) To make money harder to borrow or obtain.
To strengthen; to confirm.
(Grammar) To apply a tense to.
To apply jewels to; stud:
(Psychology) To reward (an experimental subject, for example) with a reinforcer subsequent to a desired response or performance.
To produce rigidness akin to stone.
To become set in a rigidly conventional pattern:
To become fixed, settled, or less subject to change:
To tighten, esp. by stretching
To bolster is to support or strengthen something.
To render senseless or inactive, as from shock or boredom:
To stiffen with or as if with starch
To cause (a currency or economy) to undergo inflation.
To return to use, currency, activity, or notice:
Invigorate is defined as to give strength or energy, or to instill with excitement and energy.
To evaporate is defined as to turn from a liquid into a gas, or to stop existing.
(Chemistry) To be separated from a solution as a solid.
To influence the outcome or actions of (something) by improper or unlawful means:
To prop is to position something in a way that it can provide support, or to lean an object up against something else so it stays close to upright.
To strengthen or harden.
To coat with crystals, as of sugar.
To cook, preserve, saturate, or coat with sugar or syrup:
To become cold or set:
To stop the motion or progress of:
To condense is to make something shorter or more concentrated, or to cause to change from a gas or vapor to a liquid.
To thicken; coagulate; jell
The definition of coagulate means for a liquid to become a soft mass or a clot.
To clot is to thicken.
To acquire the consistency of jelly:
To make looser or less tight:
The definition of melt is to turn from a solid to liquid as a result of exposure to heat.
To melt (a solid) by heating.
To make or become weak or weaker.
To reduce in intensity; slacken:
To make or become moist
(Intransitive) To become soft or softer
Find another word for stiffens. In this page you can discover 42 synonyms, antonyms, idiomatic expressions, and related words for stiffens, like: constrains, tightens, thickens, tenses, sets, reinforces, petrifies, ossifies, hardens, braces and bolsters.