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Something that does not have flavor is something that doesn't taste good, i.e. something that's bad-tasting, or maybe unappetizing.
You can even use this for unfavorable or "unappetizing" situations too, like 不味いところで会った (we ran into each other at a bad time).
The reading doesn't follow any of the rules you've run into. It's まずい. Think about how you're going through this really long maze (まず) and how you're promised a really tasty wonderful treat at the end for getting through it (you're a lab rat or something). When you get to the end, there's your treat! What joy! You eat it and... oh man... it is so bad-tasting you can't even believe it. Be sure to imagine the terrible taste and the terrible disappointment after going through that difficult maze only to get this... this... terribly unappetizing cheese.
彼女とデートで入った店のコーヒーが、とても不味かった。
The coffee at the cafe my girlfriend and I went to on a date tasted awful.
「このコーヒー、不味いね」と言ったら、彼女は少しこまった顔をした。
"This coffee tastes bad," I said, and she looked a little uncomfortable.
「ここ、うちの父の店なんだ」と言われた。これはかなり不味い。
"This is my dad's cafe," she told me. Well, this wasn't good.
その時、後ろから「何が不味いって？」と男の人の声がした。これはますます不味いことになった。
Just then, I heard a man's voice behind me. "What did you say was bad?" Now things had gotten even worse.
気づけば、さっきまで不味かったコーヒーの味も、もう分からなくなっていた。
Before I knew it, I couldn't even taste the coffee that had seemed so awful just a moment ago.
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