Origin: Latin suffix -able
Unsuitable has 5 different meanings across 1 category:
not meant or adapted for a particular purpose
"a solvent unsuitable for use on wood surfaces"
not worthy of being chosen (especially as a spouse)
"After hearing about his gambling debts, Sarah decided he was unsuitable for marriage."
Not suitable; unfit; inappropriate.
"The shoes were too stiff and uncomfortable, making them unsuitable for a long hike across rocky terrain."