This is the 15570th most frequent Polish word.
straconego
"Straconego" means "lost" or "wasted" in English.
Here, 'stracony' is used as an adjective modifying 'czas' (time), indicating time that has been wasted or lost.
Czas stracony na niepotrzebne kłótnie nigdy nie wraca.
Time lost on unnecessary arguments never returns.
In this sentence, 'straconego' modifies 'życia' (life) and describes a life perceived as spent or wasted.
Współczuję mu poczucia straconego życia.
I sympathize with him for the feeling of a wasted life.
The term 'straconego' here serves as an adjective describing 'przedmiotu' (item), indicating an object that has been lost or misplaced.