COGENT

appealing forcibly to the mind of reason; convincing

powerfully persuasive

SYN - telling, weighty

"He had hoped to come in and just flat-out deny every argument thrown at him, but the first one was so cogent he quickily abandoned his position and gave in."

"It was these simple, yet cogent calls to action that made him such a potent leader."

"She was so flung around by passion, only the most cogent arguments could get through to her."

"He had tried his hardest not to like these eastern philosophies, but the one before him was so cogent it was hard for him to deny."