Wiktionary
adv. Used to say that an occurrence, or situation, is not only fortunate, but that for the contrary, it could have been a lot worse. Or that something that first glance might seem bad, is actually good just because it could have been even much worse or because the alternative case or cases could have been even much worse.
Usage examples of "just as well".
The first part of the trip, cross-country, was rough, and it was just as well Grofield had passed out at the beginning of it.
It would do as fuel for the engines just as well as the normal gel.
I slept six hours in Room 31 at the Harbour Hotel with traps at the door and the window and then got up and showered and took the stuff out of the canvas case and tried on the wet suit again and tested the mask, putting talc on the fins and taping the safety marker to black it out: they might just as well have painted a bull's-eye on the back of the suit, bang on the tenth vertebra.
The thing was that I might just as well have taken the cheapest according to standing orders, the Moskwicz 408, because if I wanted any heat in the Fiat I'd have to keep starting up every half-hour and they'd hear that and wonder why I never got into gear and moved off.
I can't stand these hot wet climates, you might just as well be in a sauna bath.
It was just as well Marianne did not see the look on the man's face as he studied her, or hear the brief exchange between Maggie and the driver.
He was a few minutes late, which was just as well, because I had changed clothes three times.
Sneak Attack: Could just as well be 2,048 X 2,048, with 256 (8-bit) gray levels.