You can tell when I'm out of bacon by my lugubrious attitude.

Poached from Merriam-Webster:

Lugubrious Definition & Meaning - Merriam-Webster

Lifted from Quara:

1.

When and why would you chose the word “lugubrious"?

When it is more descriptive, more apt to what you wish to convey , better sounding and succinct. Two characters where lugubrious is descriptive, apt and sounds how they are:

The donkey character, Eeyore, in the book Winnie the Pooh Eeyore - Wikipedia Marvin the Android in the book/televised series Hitchhikers Guide to the galaxy. Marvin the Paranoid Android - Wikipedia

lugubrious:

Adjective : looking or sounding sad and dismal."his face looked even more lugubrious than usual" synonyms:mournful · gloomy · sad · unhappy · doleful · Eeyorish · glum · melancholy · melancholic · woeful · miserable · woebegone · forlorn · despondent · dejected · depressed · long-faced · sombre · solemn · serious · sorrowful · morose · dour · mirthless · cheerless · joyless · wretched · dismal · grim · saturnine · pessimistic · funereal · sepulchral · dirge-like · elegiac · down in the mouth · down in the dumps · blue · looking as if one had lost a pound and found a penny · dolorous

2.

When and why would you chose the word “lugubrious"?

Funny you should ask. I was telling some grad students that not all the Middle English they were about to read was lugubrious, when the star student in the class asked what that word meant. I decided not to do that any more.

When and why would you ever choose to use the word 'lugubrious'? - Quora