(information theory) lossless

compression / (computing) compression of an archive

to compress, to condense / (computing) to compress an archive

(colloquial) -less

(Internet) to reply; to respond

(Internet) reply; response (to an electronic message)

(euphemistic) sexless, having no sexual activity for a long time (between a married couple)

file (collection of papers) / (computing) file

to lose (time, money, etc. against a plan)

a loss / (neologism) a feeling of missing something