The correct spelling of the word "in actively" is "inactively". This word consists of four syllables and is pronounced as /ɪnˈæktɪvli/. The first syllable is "in" pronounced as /ɪn/, followed by "ac" pronounced as /æk/, and the third syllable is "tiv" pronounced as /tɪv/. The last syllable is "ly" pronounced as /li/. Inactive is an adjective that describes something or someone that is not active or is idle.