If something is unpleasant, it gives you bad feelings, for example by making you feel upset or uncomfortable.
双语例句
例： The symptoms can be uncomfortable, unpleasant, and serious.
那些症状可能令人不适，很不舒服，甚至会比较严重。
例： The vacuum has an unpleasant smell.
这个真空吸尘器有股难闻的气味。