Formidable
very powerful and scary, e.g. a storm or an enemy
Futile
pointless or useless, e.g. efforts
Scorching
extremely hot, e.g. a very hot summer day
Hideous
very ugly or unpleasant, e.g. an ugly monster, dress building
Impeccable
perfect and without mistakes, e.g. service, English
Searing
very intense or burning, e.g. a very intense pain or heat
Affluent
having a lot of money or wealth, e.g. a very rich family
Tedious
boring and long, e.g. a boring lesson or a journey
Amiable
friendly and kind, e.g. a very kind and friendly young man