I like the class, but it's still too powerful overall compared to any other core class. Change Determined Spirit so the Adventurer is still limited to only a partial action each round when at 0 hit points or less. Make Indomitable Spirit add a straight +10 increase to the number of negative hit points it takes to kill the character; an Adventurer should not have an effective 30 extra hit points of consciousness by 20th-level with no restrictions despite bleeding and crippling pain from mortal wounds the whole time. Remove Evasion altogether. Reduce the Keen Senses rate of increase to +1 every four additional levels. Move Awareness up to 11th-level. Decrease Indomitable Body to Resistance 4 initially and then +1 to the Resistance per three additional levels. Change the selectable Special Abilities to 14th, 17th, and 20th-level. Maybe reduce the saves to average like Cyberzombie recommended, too. Then your Adventurer core class should be at least close to balanced, not overshadowing rogues, barbarians, and monks all at once...