weakly / weekly 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. 👇
weakly: (adverb) in a weak or feeble manner or to a minor degree.
weekly: (noun) a periodical that is published every week (or 52 issues per year). (adjective) of or occurring every seven days.
weakly: w·IY·k·l·iy
weekly: w·IY·k·l·iy
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)