Buttoned-up and Low-pitched

Buttoned-up adjective - Having or showing a lack of friendliness or interest in others.

Low-pitched and buttoned-up are semantically related. In some cases you can use "Low-pitched" instead an adjective phrase "Buttoned-up".

Low-pitched adjective - Used of sounds and voices; low in pitch or frequency.

Buttoned-up and low-pitched are semantically related. Sometimes you can replace phrase "Buttoned-up" with "Low-pitched", this phrases are similar.