peculiar
1 abnormal, bizarre, curious, eccentric, exceptional, extraordinary, far-out (slang) freakish, funny, odd, offbeat, off-the-wall (slang) outlandish, out-of-the-way, outré, quaint, queer, singular, strange, uncommon, unconventional, unusual, wacko (slang) weird
2 appropriate, characteristic, distinct, distinctive, distinguishing, endemic, idiosyncratic, individual, local, particular, personal, private, restricted, special, specific, unique
Antonyms
1 commonplace, conventional, expected, familiar, ordinary, usual
2 common, general, indistinctive, unspecific