stiffer is a form of:

Stiff



noun
1.
(SLANG) (A corpse) ខ្មោច
Example: Stiff wire, stiff brush, Stiff neck, arm, Stiff paste, soil, Stiff refusal, Stiff in manner, in style of writing, in design, a stiff price a stiff climb, A stiff wind blew down the branch a stiff punishment.
adjective
1.
(not bending or moving or changing its shape easily, not fluid, thick and hard to stir, difficult, formal in manner, moving swiftly, containing much alcohol harsh, resolute high) stiff collar ដែលរឹង, stiff joints ដែលតឹង, ដែលពិបាកអត់ចុះបត់ឡើង, stiff winds ដែលខ្លាំង, stiff competition ដែលពិបាក, stiff jelly ដែលរឹង, stiff resistance ដ៏ស្វិតស្វាញ, លែង, stiff manner ដែលមិនទន់ភ្លន់
Example: A sheet of stiff cardboard.
adverb
1.
(to a stiff condition completely) យ៉ាងច្រើន, យ៉ាងខ្លាំង, ច្រើនណាស់
2.
(បច្ចេកទេស) រឹង, តឹង, បែបផ្លូវការ
ENGLISH MEANING
adjective
1.
Not easily bent; not flexible or pliant; not limber or flaccid; rigid; firm; as, stiff wood, paper, joints.
2.
Not liquid or fluid; thick and tenacious; inspissated; neither soft nor hard; as, the paste is stiff.
3.
Firm; strong; violent; difficult to oppose; as, a stiff gale or breeze.
4.
Not easily subdued; unyielding; stubborn; obstinate; pertinacious; as, a stiff adversary.
5.
Not natural and easy; formal; constrained; affected; starched; as, stiff behavior; a stiff style.
6.
Harsh; disagreeable; severe; hard to bear.
7.
Bearing a press of canvas without careening much; as, a stiff vessel; -- opposed to crank.
8.
Very large, strong, or costly; powerful; as, a stiff charge; a stiff price.
1.
constrained, formal, inflexible, obstinate, prim, resolved, rigid, severe, stern, stilted, strict, stringent, unbending, unyielding
2.
abrupt, awkward, clumsy, crude
1.
compassionate, lax, lenient, mild