回味無窮

leaving a rich aftertaste / (fig.) memorable / lingering in memory

to circle / to go back / to turn around / to answer / to return / to revolve / Hui ethnic group (Chinese Muslims) / time / classifier for acts of a play / section or chapter (of a classic book)

to curve / to return / to revolve

variant of 迴|回[hui2]

to reflect on / to ponder over / aftertaste

taste / smell / (fig.) (noun suffix) feel / quality / sense / (TCM) classifier for ingredients of a medicine prescription

not to have / no / none / not / to lack / un- / -less

endless / boundless / inexhaustible

poor / destitute / to use up / to exhaust / thoroughly / extremely / (coll.) persistently and pointlessly