not easily upset or frightened; not easily influenced by other people
مقاوم, محکم, استوار, تزلزلناپذیر
You need strong nerves to ride a bike in London.
Every child needs to develop a strong sense of identity.
It's difficult, I know. But be strong!
She’s had a strong will since she was a baby.
We must stand strong in the face of adversity.
see also headstrong, strong-minded, strong-willed