| radically distinctive and without equal | (sometimes followed by `to') applying to or characterized by or distinguishing something particular or special or unique |
| the single one of its kind | being or affecting a disease produced by a particular microorganism or condition; used also of stains or dyes used in making microscope slides |
| (followed by `to') applying exclusively to a given category or condition or locality | relating to or distinguishing or constituting a taxonomic species |
| highly unusual or rare but not the single instance | stated explicitly or in detail |