Here's what rhymes with indefinitely.
definitely Words that almost rhyme with indefinitely
delicately intentionally perilously petulantly genitally decadently delicacy genuinely affectionately preeminently sedulously relevantly tenuously resonantly maritally garrulously decadency exceptionally celibacy gentlemanly plentifully unintentionally congenitally incredulously relevancy telegraphy textually irrelevantly sensually sensuously tremulously querulously venomously credulously nebulously obsessionally eventually presidency conventionally professionally benevolently irrelevancy technocracy desultorily malevolently bidirectionally mellifluously expressionlessly unexceptionally unprofessionally unconventionally selenography