The Russian for "ability" is "способность":
The Russian for "definition" is "точность":
The Russian for "disappointment" is "разочарование":
The Russian for "intelligent" is "умный":
The Russian for "particular" is "особенный":
The Russian for "reason" is "причина":
The Russian for "to leave" is "уезжать, покидать":
The Russian for "to surround" is "терять":