1. a state of partial or total darkness; "he struck a match to dispell the gloom"

(synonym) gloom , sombreness

(hypernym) semidarkness

2. a feeling of melancholy apprehension

(synonym) gloom , gloominess

(hypernym) melancholy

3. a manner that is serious and solemn

(synonym) graveness , gravity , sobriety , soberness

(hypernym) seriousness , earnestness , serious-mindedness , sincerity

(hyponym) stodginess , stuffiness