Dreary (adjective)

1. Feeling or inspiring a sense of gloom; dull and gloomy.
2. Lacking in interest or excitement; dull and tedious.

Origin:

Middle english dreri, from old english drēorig "sad, mournful" from drēor "tears".

Examples:

1. The dreary weather matched her mood perfectly.
2. The dreary landscape was almost completely devoid of color.
3. The dreary atmosphere of the office made it hard to focus.
4. The dreary conversation made everyone feel unenthusiastic.
5. The dreary lecture made it hard to stay awake.