All 5 Uses

lament
in
Seabiscuit, by Hillenbrand
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"None of them," Fitzsimmons lamented, "ever won the dollar."†
Chpt 1.3

lamented = expressed grief or regret
His win percentage dropped to a lamentable 6 percent.†
Chpt 1.6 *

lamentable = regrettable

standard suffix: The suffix "-able" means able to be. This is the same pattern you see in words like breakable, understandable, and comfortable.
"Tom Smith," lamented a reporter, "is by no means a long distance conversationalist.†
Chpt 2.9

lamented = expressed grief or regret
Howard, who had been loudly and publicly lamenting Riddle's demand for the walk-up, seemed in private to be delighted.†
Chpt 2.18

lamenting = expressing grief or regret
Overhearing a valet lamenting the lack of funds to create an all-jockey baseball team, he jumped in.†
Chpt 3.22

Definitions:

(1) (lament)
to express grief or regret
(2) (meaning too rare to warrant focus)
Although lament typically refers to a feeling or simple vocal expression, it can refer to a vocal expression as complex as a sad song or poem. It can even refer to sad, but non-vocal music -- as when Tennessee Williams references background music in A Streetcar Named Desire.