/ ˈlæməntəbl; NAmE ; ləˈment-/ adjective
( formal ) very disappointing
SYN deplorable , regrettable :
She shows a lamentable lack of understanding.
► lam·ent·ably / -əbli; NAmE / adverb
••
WORD ORIGIN
late Middle English (in the sense mournful , also pitiable, regrettable ): from Old French , or from Latin lamentabilis , from the verb lamentari , from lamenta (plural) weeping, wailing.