Adolescence /ˌæd

challenge /ˈtʃæl.ɪndʒ/ noun INVITATION
2. [ C ] an invitation to compete or take part, especially in a game or argument
"I bet you can't eat all that food on your plate." "Is that a challenge?"
[ + to infinitive ] She issued a challenge to her rival candidates to take part in a public debate.
challenge /ˈtʃæl.ɪndʒ/ noun REFUSAL
5. [ C ] legal a refusal to accept someone as a member of a jury
A challenge to a member of the jury should be made before the trial begins.
credibility /ˌkred.əˈbɪl.ɪ.ti/ /-ə.t ̬i/ noun [ U ]
when someone can be believed or trusted
His arrest for lewd behaviour seriously damaged his credibility as a religious leader.
He complained that we had tried to undermine his credibility within the company.