WordNet sense 1 (tall and thin and having long slender limbs):

lanky

WordNet sense 2 (lofty in style):

grandiloquent, magniloquent

WordNet sense 3 (concerned with effect or style of writing and speaking):

rhetorical

WordNet sense 4 (not easy; requiring great physical or mental effort to accomplish or comprehend or endure):

difficult, hard

WordNet sense 5 (too improbable to admit of belief):

improbable, marvelous, marvellous

WordNet sense 6 (beyond belief or understanding):

incredible, unbelievable