Dreadful; causing terror, alarm and fear; awesome / Formidable, powerful. / Intense; extreme in degree or extent. / Unpleasant; disagreeable. / Very bad; lousy.

(colloquial, dialect) In a terrible way; to a terrible extent; terribly; awfully.

The characteristic of being terrible.

plural of terribleness

(rare) comparative form of terrible: more terrible

(literary or dated) So as to cause terror or awe. / Very; extremely. / Very badly.

plural of terribility

The quality of being terrible.

An unconventional badly-behaved person who causes embarrassment or shock to others. / An unusually successful person who is strikingly unorthodox, innovative, and/or avant-garde.

plural of enfant terrible