plangent
Concise Oxford English Dictionary © 2008 Oxford University Press:
plangent /ˈplan(d)ʒ(ə)nt/
▶adjective chiefly literary (of a sound) loud and resonant, with a mournful tone.
– derivatives
plangency noun,
plangently adverb.
plangency noun,
plangently adverb.
– origin C19: from L. plangent-, plangere ‘to lament’.
'plangent' also found in these Oxford entries:

