The phrase "adequate entertainment" is correct and usable in written English.
You can use it to describe entertainment that is satisfactory or meets a certain standard, but may not be exceptional.
Example: "The movie provided adequate entertainment for a rainy afternoon, but it didn't leave a lasting impression."
Alternatives: "sufficient entertainment" or "acceptable entertainment".
Dave Kehr of the Chicago Tribune gave the film three out of four stars, saying "Beauty and the Beast is certainly adequate holiday entertainment for children and their more indulgent parents...
An adequate piece of entertainment wildly surpasses our expectations.
Anything is possible, including that millions of parents and children might flock to this adequate morsel of committee-produced entertainment.
But that movie, in part as a result of Glenn Close's delicious villainy in the role of Cruella DeVil, was at least an adequate piece of children's entertainment and a harmless bit of nostalgia for the grown-ups.
It is an adequate piece of children's entertainment, though it seems better suited for home viewing -- while parents can cook dinner, read the paper or balance the checkbook -- than for the big screen.
Only a quarter of the respondents agreed that there were adequate options for leisure and entertainment.
Furthermore, those who planned to remain found adequate options for leisure and entertainment in their respective areas of assignment.
Expenses for discretionary items like entertainment, dining out, and buying new clothes should be adjusted to ensure adequate savings necessary to achieve long term investment objectives.
The other is to take your own entertainment items because you don't trust that the airline's offerings are adequate.
By moving the ball in realtime, in video, in a good enough latency to allow an adequate simulation of face to face interaction between charging stations, will take a bite about travel, entertainment, social gestures, political control.
