As suitable means appropriate for the purpose, you can imagine that sneakers are more suitable than high heels at a track meet.

While suitable always means appropriate for a certain person or situation, sometimes it is not based on fact but merely a matter of opinion. A bicycle is not a suitable mode of transportation during a winter storm because the rider is exposed to the elements. However, the clothing that you think is just fine for school might seem unsuitable to the principal. Unfortunately, he has the final say in that one!

Definitions of suitable

adj meant or adapted for an occasion or use

“a tractor suitable (or fit) for heavy duty”
meeting adequate standards for a purpose

adj worthy of being chosen especially as a spouse

“the parents found the girl suitable for their son”
desirable, worthy
qualified for or allowed or worthy of being chosen

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