for·bid·ding 
(fər-bĭdĭng, fôr-)
(fər-bĭdĭng, fôr-)adj.
1. Tending or threatening to impede progress: forbidding rapids.
2. Unpleasant; disagreeable: a forbidding scowl.
3. Having a menacing aspect: forbidding thunderclouds.
for·bidding·ly adv.