Impotent (adjective)

1. Lacking strength, power or effectiveness.
2. Lacking physical or sexual ability.

Origin:

The word 'impotent' comes from the latin word 'impotens' which means 'unable to do'. it has been in use in english since the early 15th century.

Examples:

1. The small country was impotent in the face of the invading army.
2. The once mighty empire was reduced to an impotent state.
3. His impotent anger was evident in his clenched fists and red face.
4. The impotent protests of the citizens were ignored by the government.
5. His impotent attempts to lift the heavy weight only made the onlookers laugh.