1. (adjective) having only superficial plausibility

• pat
• slick

2. (adjective) artfully persuasive in speech

• glib-tongued
• smooth-tongued

1. (adjective) marked by lack of intellectual depth

• superficial

2. (adjective) having only superficial plausibility

• plausible

3. (adjective) artfully persuasive in speech

• persuasive

1. (adjective) marked by lack of intellectual depth

• glibness
• slickness

2. (adjective) having only superficial plausibility

• glibness
• glibness
• slickness
• slickness

3. (adjective) artfully persuasive in speech

• glibness
• slickness