I think that the options you have are gloom, temptation, forgiveness and suspicion. The option that you are looking for is gloom which is more inclined to a depressed environment with those words.
The phrase "<em>Beside the sea an old grey dog</em>"<em> </em>presents iambic tetrameter.
Iambic tetrameter consists of four iambic feet, each one with an unstressed syllable followed by a stressed syllable.
The stressed syllables are presented as follows (stresses syllables are in all capitals):
beSIDE the SEA an OLD grey DOG - da DUM da DUM da DUM da DUM
In the second sentence, the adjective is delighted. In the third sentence, the adjective is large. The first sentence doesn't contain an adjective.
