Decent means suitable, fit, or proper: “They were on strike demanding decent working conditions.”
Descent means the act of going down; a downward drop: “The hill had a sharp descent that needed one to be careful while driving.”
Dissent, as a noun, means a disagreement: “Dissent among members of political parties is common.”
As a verb, it means to disagree, to contradict, to differ in opinion or feeling, or to wrangle: “During the debate in parliament, members often would dissent and contradict each other.”
“The two members of government would often dissent with each other about legal matters; however, they continued to be friends.”
I wore decent climbing clothes for the challenging descent of the mountain and I certainly didn’t dissent with my friend’s opinion that it was very scary at times.