Moping: is a verb that means moving slowly and being sad because of something that happened, in this case is because her first-choice college rejected her.
Commission: is a noun that means a group of people that was chosen for a specific task.
Weak: is a verb, in this case it means that there were not enough evidence or lack of it to prove what he did.
Hostility: is a noun that means being unfriendly towards someone, in the example Sam and Max are not unfriendly to each other when they are out of the court.
I think the answer is "Even now when they see the storm clouds gathering, the Kiowas know what it is: that a strange wild animal roams on the sky. ...But they speak to it, say "Pass over me." They are not afraid of Man-Ka-ih, for it understands their language."