Answer:
Just use them. They are all adjectives!
高 KOU, taka(i) - high
難 NAN, muzuka(shii), kata(i) - difficult
冷 REI, tsume(tai), hi(yasu), sa(masu) - cold, chill, poke fun at
珍 CHIN, mezura(shii) - rare, unusual
疎 SO, uto(mu), uto(i) - shun, neglect, distant