A propensity for sorrow, appetence held tight in the chest
turns human coal adamantine, fortitude grows from misfortune
Not facetiously forcing optimism where hope grasps for breathe
propensity (noun)
a natural inclination
an inclination to do something
a disposition to behave in a certain way
New York Times
Appetence (noun)
intense desire; strong natural craving
dictionary.com
Adamantine (adjective)
Unyielding; inflexibly firm.
Resembling adamant or diamond in hardness or luster.
WordSmith
Fortitude (noun)
strength of mind that enables a person to encounter danger or bear pain or adversity with courage
Merriam-Webster
Facetiously (adverb)
not seriously
vocabulary.com
Sijo: Three lines with 14-16 syllables per line.