Which definition in the entry best states the meaning of the word formidable in this sentence?

To the tired track runner, the formidable last hurdle looked twice as large as it actually was.

definition 1

definition 2

definition 3

definition 4

images of intense weather events

"get off of your lazy bum and come running with me or i'm dumping this pitcher of water on u " u say with a smile. she thinks your joking so she ignores you about 10 seconds later shes screaming wile water is dripping everywhere you say "here comes the second one! " then you here her say okay, your such a j e r k ! ill be ready in 5 put the pitcher down " she say in an angry tone. and you smile in victory

good enough?

where are the options? i can try to if you add them : )