adjective
moist, damp, humid
B1
feucht is an adjective meaning 'moist', 'damp', or 'humid'. It's gradable (comparative feuchter, superlative am feuchtesten) and antonym of 'trocken'. Used attributively or predicatively (e.g., 'Der Boden ist feucht'). Not a participle; no special preposition or reflexivity required. Common collocations: 'feucht sein', 'feuchte Luft'.
Examples
Der Keller ist feucht nach dem starken Regen.
The basement is damp after the heavy rain.
Der Keller blieb feucht, obwohl die Besitzer den Raum neu isoliert hatten.
The cellar remained damp even though the owners had recently insulated the room.
In den Tropen ist es oft sehr feucht und warm.
In the tropics it's often very humid and warm.
Details
Mnemonics
Picture a towel that is not dry but lightly wet — that's feucht.
Sounds a bit like 'few-cht' — imagine a 'few' drops on something.
Notes
'Feucht' implies some moisture but less than 'nass' (wet). Used for weather (humid), materials (damp), and surfaces that are slightly wet.