afraid
alone
branch
brave
business
businessman
castaway
challenge
chance
concept
conceptual
courage
crisis
danger
dare
dark
depression
doomed
entrepreneur
failure
forest
gloomy
idea
illustration
jungle
limitations
lonely
lost
man
metaphor
mysterious
mystery
nature
plant
problem
risk
silhouette
spooky
survival
survive
survivor
symbol
tree
unpredictable
wilderness
woods