'Weak' in the Bible

Stop regarding man, whose breath [of life] is in his nostrils [for so little time];For why should he be esteemed?

“All of them will respond [tauntingly] and say to you,‘You have become as weak as we are.You have become like us.

Encourage the exhausted, and make staggering knees firm.

“He will not be disheartened or crushed [in spirit];[He will persevere] until He has established justice on the earth;And the coastlands will wait expectantly for His law.”

“For the moth will eat them like a garment,And the worm will eat them like wool.But My righteousness and justice [faithfully promised] will exist forever,And My salvation to all generations.”