| fixed(adjective, intense, determined, thoughtful, sober) |
| for real(expression, adjective, thoughtful, sober, serious) |
| formidable(adjective, tough, severe, important, significant) |
| four-star(great, heavy) |
| front-page(great, heavy) |
| grave(adjective, great, tough, severe, heavy) |
| hard(adjective, tough, severe, important, significant) |
| heavy(great, severe, weighty, crucial) |
| high-power(great, heavy) |
| intense(adjective, deliberate, determined, sober, serious) |
| intent(adjective, intense, deliberate, determined, thoughtful) |
| laborious(adjective, tough, severe, important, significant) |
| major(great, severe, heavy, weighty, crucial) |
| mean business(expression, adjective, intense, deliberate, determined) |
| meaning business(expression, adjective, tough, severe, important) |
| meaningful(adjective, tough, severe, important, significant) |
| no-fooling(adjective, determined, thoughtful, sober, serious) |
| no-nonsense(adjective, thoughtful, sober, serious, sincere) |
| no joke(expression, adjective, tough, severe, important) |
| no laughing matter(expression, adjective, idiom, tough, severe) |