Altered carbon
The Protect device made by Nest can detect this dangerous gas, in addition to smoke
Carbon Monoxide
Derived from an Old French word for "trust", it's a person engaged to be married
fiancé
It can mean to tangle up or to growl viciously, especially with the teeth bared like an animal
Snarl
Something that is this place "variety", such as a carrot, is unremarkable
garden
Cease to be / change the color
Die/Dye
A sheet of carbon atoms is formed by strong covalent bonds. However, the bonds connecting multiple sheets are much weaker, resulting in this soft substance, used in pencils
Graphite
In French it means "memory"; in English it's a keepsake to remember you by
Souvenir
This word that means to put into words begins with a part of speech
Verbalize
A sufficient effort is this, as is a road once it has been cleared of debris
passable
Reveal one's soul / endure hardship
Bare/bear
This solid residue left when coal is distilled sounds like a refreshing beverage
Coke
From an Old French word that meant a wine taster, to us it's a connoisseur of fine food & drink
Gourmet
To prevaricate is to do this; trust me
To lie
This 8-letter adjective for middling effort comes from words meaning "halfway up the mountain"
Mediocre
Make into sets of 2 / remove an apple peel
Pair/pare
Used in carbon dating, the isotope radiocarbon has this number for its approximate atomic weight
14
Now also meaning a nightclub or bar, this type of cafe lends its name to a salad made with salt pork & eggs
Bistro
To signal to action, or to cue an actor from offstage with a forgotten line
Prompt
Add an "A" to the middle of a non-holiday to get this word meaning "ordinary"
Listened to / assemble the flock
Heard/herd
Mix carbon with nitrogen & hydrogen to get this type of poison aka prussic acid--actually, don't
Cyanide
For many of us, "Jeopardy!" is this, our "reason for being"
raison d'être
To imitate, or to deride; it was done to Jesus, according to Luke 22:63
Mock
This "P" word that can mean "dull" is also a literary term, the opposite of poetic
Prosaic
To lament one's fate / taken care of, as the lawn
Moan/Mown