vice-chairman/vies/ noun (pl vice-chairmen)

• unambiguous
• un-American
• unanimous
• unannounced
• unanswerable
• unappealing
• unappetizing
• unapproachable
• unapt
• unarmed
• unashamed
• unasked
• unassailable
• unassertive
• unassisted
• unassuming
• unattached
• unattended
• unattractive
• unauthorized
• unavailable
• unavailing
• unavoidable
• unaware
• unawares