You use strange to say that something is unfamiliar or unexpected in a way that makes you puzzled, uneasy, or afraid.
If you just want to say that something is not common, you use unusual, not 'strange'.
| Adj. | 1. | strange - being definitely out of the ordinary and unexpected; slightly odd or even a bit weird; "a strange exaltation that was indefinable"; "a strange fantastical mind"; "what a strange sense of humor she has"familiar - within normal everyday experience; common and ordinary; not strange; "familiar ordinary objects found in every home"; "a familiar everyday scene"; "a familiar excuse"; "a day like any other filled with familiar duties and experiences" |
| 2. | strange - not known before; "used many strange words"; "saw many strange faces in the crowd"; "don't let anyone unknown into the house" unfamiliar - not known or well known; "a name unfamiliar to most"; "be alert at night especially in unfamiliar surroundings" | |
| 3. | strange - relating to or originating in or characteristic of another place or part of the world; "foreign nations"; "a foreign accent"; "on business in a foreign city" |