One-word Subsitute - 2

One who looks up the world as his - Cognomen

Not bearing upon the matter in hand - Irrelevant

Murder of one man by another - Homicide

Incapable of being heard - Illegible

Incapable of being read - Inaudible

A decision upon which one cannot go back - Irrevocable

A speech delivered on the spur of the moment - Somnambulist

A round-about way of expressing oneself - Circumlocution

Words having the opposite meaning - Antonyms

A general pardon granted to criminals - Amnesty