'Frail' in the Bible

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

A voice says, “Call out [prophesy].”Then he answered, “What shall I call out?”[The voice answered:] All humanity is [as frail as] grass, and all that makes it attractive [its charm, its loveliness] is [momentary] like the flower of the field.