(Homonym: dyer).
1. Ill-boding; portentous.
2. Evil in great degree; dreadful; dismal; horrible; terrible; lamentable.

Characterized by firm belief in the validity of one's opinions; SYN. in earnest, sincere, solemn.

1. Dignified and somber in manner or character; SYN. sedate, sober, solemn.
2. Of great gravity or crucial import; requiring serious thought; SYN. grievous, heavy, weighty.

Not to be placated or appeased or moved by entreaty; SYN. inexorable, relentless, stern, unappeasable, unforgiving, unrelenting.

ETYM Latin serius: cf. French sérieux, Late Lat. seriosus.
1. Concerned with work or important matters rather than play or trivialities.
2. Of great consequence.
3. Requiring effort or concentration; complex and not easy to answer or solve.