regrettable (adj.)
- abominable
- affecting
- afflictive
- arrant
- atrocious
- awful
- base
- beastly
- bitter
- blameworthy
- bleak
- brutal
- calamitous
- cheerless
- comfortless
- contemptible
- deplorable
- depressing
- depressive
- despicable
- detestable
- dire
- disgusting
- dismal
- dismaying
- distressful
- distressing
- dolorous
- dreadful
- dreary
- egregious
- enormous
- execrable
- fetid
- filthy
- flagrant
- foul
- fulsome
- grievous
- gross
- hateful
- heartbreaking
- heinous
- horrible
- horrid
- infamous
- joyless
- lamentable
- loathsome
- lousy
- monstrous
- mournful
- moving
- nasty
- nefarious
- noisome
- notorious
- obnoxious
- odious
- offensive
- outrageous
- painful
- pathetic
- piteous
- pitiable
- pitiful
- poignant
- rank
- reprehensible
- repulsive
- rotten
- rough
- rueful
- sad
- scandalous
- scurvy
- shabby
- shameful
- sharp
- shocking
- shoddy
- sordid
- sore
- sorrowful
- squalid
- terrible
- touching
- tough
- unclean
- uncomfortable
- unfortunate
- unhappy
- unlucky
- upsetting
- vile
- villainous
- woebegone
- woeful
- worst
- worthless
- wretched
- wrong
