1. [Brit] Not inclined to conversation 
2. Conservative in professional manner
   "employers are looking for buttoned-up types"

See also: conservative, taciturn

• ambidextrous
• ambidextrously
• ambidextrousness
• ambience
• ambient
• ambiguity
• ambiguous
• ambiguously
• ambisexual
• ambit
• ambition
• ambitionless
• ambitious
• ambitiously
• ambitiousness
• comatulid
• Comatulidae
• comb
• comb jelly
• comb-footed spider
• comb-like
• comb-out
• comb-plate
• combat
• combat area