bad / bade are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
bad: (noun) that which is below standard or expectations as of ethics or decency. (adjective) having undesirable or negative qualities. (adjective) very intense. (adjective) feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad'). (adjective) (of foodstuffs) not in an edible or usable condition. (adjective) not capable of being collected. (adjective) below average in quality or performance. (adjective) nonstandard. (adjective) not financially safe or secure. (adjective) physically unsound or diseased. (adjective) capable of harming. (adjective) characterized by wickedness or immorality. (adjective) reproduced fraudulently. (adjective) not working properly.
bade: (noun) a Chadic language spoken in northern Nigeria.
bad: b·AE·d
bade: b·EY·d
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)