weak, faint (not strong), weakling
Ele era o mais fraco entre os que faziam a revolução.
He was the weakest among those who were making the revolution.
— Pinte de Açafrão (2006)
Everyone starts out weak.
— Demon Slayer: Kimetsu no Yaiba Castelo Infinito (2025)
Um pouco de respiração superficial, pulso fraco, é isso.
A little shallow breathing, a weak pulse, that's it.
— Piku (2015)
Ele era bem fraco na infância.
He was very weak as a child.