| strong(adjective, strain, firmness, labour, hardiness) |
| sound(adjective, strain, firmness, labour, hardiness) |
| tenable(adjective, strain, firmness, labour, hardiness) |
| impregnable(adjective, strain, firmness, labour, hardiness) |
| feasible(adjective, reasonable, practical, possible, doable) |
| practicable(adjective, reasonable, practical, realistic, possible) |
| workable(adjective, reasonable, possible, feasible, doable) |
| possible(adjective, reasonable, practical, realistic, likely) |
| achievable(adjective, reasonable, realistic, possible, desirable) |
| doable(adjective, reasonable, practical, realistic, possible) |
| practical(adjective, reasonable, active, occupied, running) |
| realizable(adjective, reasonable, likely, possible, desirable) |
| applicable(adjective, reasonable, practical, realistic, workable) |
| attainable(adjective, reasonable, realistic, possible, desirable) |
| animate(adjective, living, conscious, alive, thriving) |
| operable(adjective, reasonable, practical, realistic, possible) |
| sustainable(adjective, practical, feasible, conceivable, tenable) |
| vital(adjective, animate, life, living, conscious) |
| alive(adjective, active, animate, living, occupied) |
| executable |