| self-assured(certain, sure, guaranteed) |
| self-possessed(certain, sure, guaranteed) |
| set(certain, sure, guaranteed) |
| settled(certain, sure, guaranteed) |
| sewed up(expression, certain, sure, guaranteed) |
| sinewy(brawny, well-built, beefy) |
| solid(certain, sure, guaranteed) |
| stalwart(vigorous, sturdy, robust, brawny, well-built) |
| stout(vigorous, sturdy, robust, brawny, strapping) |
| stout-hearted(robust, well-built, zappy) |
| strapping(vigorous, sturdy, robust, brawny, well-built) |
| strong(vigorous, sturdy, robust, brawny, strapping) |
| sturdy(vigorous, robust, brawny, strapping, well-built) |
| sure(certain, guaranteed) |
| surefire(certain, sure, guaranteed) |
| two-fisted(robust, well-built, zappy) |
| undoubted(certain, sure, guaranteed) |
| unflappable(certain, sure, guaranteed) |
| unhesitating(certain, sure, guaranteed) |
| unquestionable(certain, sure, guaranteed) |