lament

(v) To express sorrow, grief, or regret about something. (n) An expression of grief or sorrow; a song or poem of mourning.

• lamentable/ˈlæməntəbl/(adj)令人遗憾的
• lamentation/ˌlæmənˈteɪʃən/(n)哀悼

• lament the loss
• lament the decline
• lament that
• lament the fact
• a lament for

1. 1.Environmentalists lament the destruction of old-growth forests for short-term economic gain. (express regret)
2. 2.The bagpiper played a haunting lament at the military funeral. (song of mourning)

• mourn/mɔːrn/— to grieve — deeper emotion
• bewail/bɪˈweɪl/— to express great sadness — more dramatic
• deplore/dɪˈplɔːr/— to feel strong disapproval — more about moral objection

from Latin "lamentum" (a wailing, a moaning) — expressing grief vocally