| potent(adjective, tough, energetic, effective, adept) |
| powerful(adjective, tough, effective, adept, effectual) |
| practiced(tough, practical, effective, controlled, orderly) |
| probable(sound, reasonable, sensible, rational) |
| productive(adjective, tough, energetic, effective, adept) |
| profitable(adjective, tough, energetic, effective, adept) |
| ratiocinative(adjective, clear, sound, logical) |
| rational(adjective, clear, sound, reasonable, sensible) |
| ready(tough, energetic, effective, adept, effectual) |
| reasonable(adjective, sound, sensible, rational, stable) |
| relevant(clear, sound, reasonable, sensible, rational) |
| saving(tough, energetic, effective, adept, effectual) |
| shipshape |
| shrewd(tough, energetic, effective, adept, effectual) |
| skilled(adjective, tough, effective, adept, effectual) |
| skillful(adjective, tough, practical, effective, controlled) |
| smart |
| sound(clear, reasonable, sensible, rational, stable) |
| spruce |
| valuable(adjective, tough, energetic, effective, adept) |