conforming to conventions of sexual behavior
"speech in this circle, if not always decent, never became lewd"
observing conventional sexual mores in speech or behavior or dress
"though one of her shoulder straps had slipped down, she was perfectly decent by current standards"
meeting requirements
"the step makes a satisfactory seat"
"I would kill for a decent cup of coffee"
"a decent wage"
Appropriate; suitable for the circumstances.
"The weather was poor, but they managed to have a decent time despite the inconvenience."
In plain English: Decent means good enough to be acceptable and respectable without being perfect.
"The hotel room was clean and decent for the price we paid."
The word decent comes from the Latin decēns, meaning "fitting" or "suitable," which entered English through Middle French around the early 16th century. Its modern sense of being kind and pleasant emerged later in 1902.