sophist

Concise Oxford English Dictionary © 2008 Oxford University Press:
sophist /ˈsɒfɪst/

▶noun

• 1 a paid teacher of philosophy and rhetoric in ancient Greece, associated in popular thought with moral scepticism and specious reasoning.

• 2 a person who uses clever but fallacious arguments.

– derivatives
sophistic /səˈfɪstɪk/ adjective,
sophistical /səˈfɪstɪk(ə)l/ adjective,
sophistically adverb.

– origin C16: via L. from Gk sophistēs, from sophizesthai ‘devise, become wise’, from sophos ‘wise’.