aghastment
/əˈɡɑːstm(ə)nt/ /əˈɡastɪm(ə)nt/rare
noun
In early use: †terror, fright, alarm (obsolete ). Later: shock, horror.
Origin
Late 16th century; earliest use found in Thomas Nashe (d. c1601), writer. Originally from agast + -ment. In later use from either aghast or aghast + -ment.