Synonyms of the word

buttoned-up

• adj. Conservative.
• adj. Carefully planned and executed.

conservative

• n. A person who favors maintenance of the status quo.
• n. (US, economics) A fiscal conservative.
• n. (US, politics) A political conservative.
• n. (US, social sciences) A social conservative.
• adj. Cautious.
• adj. Tending to resist change or innovation.
• adj. Based on pessimistic assumptions.
• adj. (US, economics, politics, social sciences) Supporting some combination of fiscal, political or social…
• adj. (Britain, politics) Relating to the Conservative Party.
• adj. (physics, not comparable) Neither creating nor destroying a given quantity.
• adj. Having power to preserve in a safe or entire state, or from loss, waste, or injury; preservative.
• adj. (Judaism) Relating to Conservative Judaism.
• adj. (clothing) Conventional, traditional, and moderate in style and appearance; not extreme, excessive, faddish,…

taciturn

• adj. Silent; temperamentally untalkative; disinclined to speak.