weakling

noun
  1. A person or animal that is physically weak or frail. noun
    Despite his efforts in the gym, he was still considered a weakling by his peers.
    The runt of the litter was a weakling, struggling to compete for food.
  2. A person lacking in strength of character or willpower. noun
    She was no weakling when it came to standing up for her beliefs.
    He was seen as a weakling because he often gave in to peer pressure.