My son, who was such a weakling and a crybaby, is already an adult.
Many Americans are cowards who can't even eat a bit of natto.
Cowards should be treated like hairy caterpillars - picked up and thrown out!
A weak insect. This is what people call weaklings in Japan. This is a good word to know if you're a bully, or something.
The reading for this one is a weird one. It uses the kun'yomi readings for both, meaning you'll have to pull your knowledge of the word 弱い from earlier and apply it here. 虫 should be okay, though, as this is the reading you learned with the kanji.
Just remember, only weak bugs use kun'yomi, and that weak bug is you in this instance.