Intelligent, ranging from warm and helpful to nerdy, obnoxious, and superior.
Articulate, clear.
Goofy, innocent, and clueless.
Wry, ironic, sarcastic.
Precise, warm, with a sense of humor.
Adult, amusing, approachable, believable, bright, caring, charming, clean, collegiate, compassionate, confident, conversational, convincing, cool, corporate, cute, dramatic, dry, energetic, engaging, fresh, friendly, fun, funny, genuine, high-energy, humorous, intelligent, kind, nasal, natural, midwest, perky, personable, professional, quick, quirky, real, refreshing, sincere, slacker, smart, smiley, smooth, soft, soothing, sophisticated, spokesperson, spunky, straightforward, strong, sweet, teenage, trustworthy, unique, unusual, upbeat, upscale, versatile, wise, witty, youthful