Synonyms of forbidding

1 Syllable
gaunt, tough, strict, stern, dour, grim, nix
2 Syllables
turndowns, gauntest, odious, grimmer, doomful, sterner, turndown, stricter, grimmest, knockback, strictest, dourer, ugly, gaunter, aloof, sternest, hardshell
3 Syllables
passionless, abhorrent, refusal, restraining, censorship, ominous, offputting, frightening, hostile, refusals, austere, glowering, unfriendly, severest, off-putting, unloving, unpleasant, severer, enjoinment, menacing, sinister, repellent, threatening, hateful
4 Syllables
repressive, malificent, remorseless, disagreeable, repulsive, iron-handed, forbiddance, offensive, precursive, foreboding, proscriptive, unrepenting, renouncement
5 Syllables
unapproachable, prohibitive, bowdlerization, premonitory