adapted adequate adjusted alert au fait brainy brilliant capable checked out clever competent effective effectual efficacious efficient enigmatic enterprising equal to expert fit fitted fitted for go-ahead good incalculable incognizable intelligent journeyman keen mysterious productive proficient proper puzzling qualified sealed sharp skilled skillful smart strange suited unapparent unapprehended unascertained unbeknown uncharted unclassified undisclosed undiscoverable undiscovered undivulged unexplained unexplored unexposed unfamiliar unfathomed unheard unheard-of unidentified uninvestigated unknowable unknown unperceived unplumbed unrevealed unsuspected untouched up to up to snuff up-and-coming virgin well-fitted well-qualified well-suited wicked worthy