very disappointing synonym deplorable, regrettable十分令人失望的;令人遗憾的;使人惋惜的 Oxford Collocations DictionaryLamentable is used with these nouns:- failure
Word Originlate 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’.