

It's unbearably muggy today; I think a storm's coming.
[ˈɪts ˌənˈbɛrəbli ˈməɡi təˈdeɪ; aɪ ˈθɪŋk ə ˈstɔrmz ˈkəmɪŋ.]
The office gets terribly muggy in the afternoon without air conditioning.
[ði ˈɑfəs ˈɡɛts ˈtɛrəbli ˈməɡi ˈɪn ði ˌæftərˈnun wɪˈðaʊt ˈɛr kənˈdɪʃənɪŋ.]
Wasn't it awfully muggy on the underground this morning?
[ˈwəzn̩t ɪt ˈɔfəli ˈməɡi ˈɔn ði ˈəndərˌɡraʊnd ˈðɪs ˈmɔrnɪŋ?]
"muggy" is in the lesson "Hot weather" (Level 15), along with 12 other useful words. LinDuo has 180 topic lessons like this one, 2,375 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.