Synonyms For "Unpleasant" :
1 syllable:
grim, harsh, hot, rough, sharp, sore, tart
2 syllables:
acerb, acid, acrid, awful, beastly, bitter, caustic, dour, hellish, nasty, painful
3 syllables:
acerbic, afflictive, blistering, displeasing, forbidding, offensive, repellant, repellent, sulfurous, sulphurous, ungrateful, unhappy, unpleasing, virulent
4 syllables:
embarrassing, inaesthetic, mortifying, rebarbative, unaesthetic, vitriolic