Translation:Bread tastes bad.
TL;DR: 맛없다 is read as a compound word that just so happens to be written without a space because arbitrary rules; the ㅅ does not carry over to the next syllable because 맛 and 없다 are two separate units. 맛있다 is not perceived to be a compound word, but one unit, so it’s pronounced (nearly 100% of the time) as [마싣따]; the ㅅ carries over to the next syllable.
Read more here: https://www.duolingo.com/comment/24520049
맛없다 means that it has no taste, or tastes bad. 맛있오 meand that it tastes good. The 없 makes it negative. Si the basic verb 있어요 (to be/to exist/to have) can be made negative be changing it to 없어요 (do not have/does not exist/to not be). 안 can also be used to make verbs and adjectives negative, it's just one of those things where sometimes you'd say 없 or you'd say 안. And in this case, 맛없다 is the combination of two words 맛, which is an adjective, and 없다 which is a verb.
I’m not sure which part is confusing you, so here’s the whole thing:
⟨빠ᇰ은 맛없습니다⟩ is pronounced [빠ᅌᅳᆫ 마덥씀니다]. (Note that I’ve written it in a way that distinguishes the silent ⟨ㅇ⟩ from the nasal velar ⟨ㆁ⟩.) The pronunciation rules apply in 3 stages:
- 빠ᇰ은 맛 없습니다 ← analyzed segments
- 빠ᇰ은 맛 업습니다 ← consonant cluster reduction
- 빠ᅌᅳᆫ 마 덥씀니다 ← enchaînement, consonant coda reduction, and other sound changes
Notice that in step 3, /ㅅ/ becomes [ㄷ]. The analysis of ⟨맛⟩ as a separate unit prevents the intact migration of /ㅅ/ to the next syllable (enchaînement), so it is first reduced to [ㄷ] before migrating to the next syllable as an initial.
Also, /ㅌ/ is not /t/; it is /tʰ/. Finals /ㅌ/, /ㅅ/, /ㅆ/, /ㅈ/, and /ㅊ/ all reduce to [ㄷ], the real /t/. The ⟨ㅌ⟩ at the beginning of a syllable is only the same as ⟨t⟩ at the beginning of an English word, but the ⟨ㅌ⟩ at the end of a syllable can only be firstly reduced to [ㄷ], which is ⟨t⟩ at the end of an English syllable. Read this for more information: What Pronunciations the Consonants are NOT.
There is also more above if you are willing to read lots. The end of my post there also links to https://forum.duolingo.com/comment/24520049.