WordNet sense 1 (unique or specific to a person or thing or category):

particular, special

WordNet sense 2 ((sometimes followed by `to') applying to or characterized by or distinguishing something particular or special or unique):

specific

WordNet sense 3 (beyond or deviating from the usual or expected):

curious, funny, odd, rum, rummy, singular

WordNet sense 4 (being definitely out of the ordinary and unexpected; slightly odd or even a bit weird):

strange, unusual

WordNet sense 5 (typical or distinctive):

characteristic