- in vain
- ineffectually
- vainly
Synonyms for inefficaciter
- casso – annul, destroy, in vain, make void, to bring to naught
- frustra – in vain, mistakenly, wantonly, without reason
- incassum – in vain, to no purpose
- inritus – in vain, ineffectual, invalid, useless, void
- irritus – in vain, ineffectual, invalid, of no effect, of not effect, undecided, unfixed, useless, vain, void