Intense; extreme in degree or extent.
Dreadful; causing terror, alarm and fear; awesome
Formidable, powerful.
Unpleasant; disagreeable.
Very bad; lousy.
In a terrible way; to a terrible extent; terribly; awfully.
The most extreme; greatest, ultimate.
Situated at the most distant limit; farthest, outermost.
The greatest possible capability, extent, or quantity; maximum.