What is the Latin word for effectless?

The usual Latin words for “effectless” are invalidus, inūtilis, sine; also ūllus, efficiō, valeō. The right choice depends on the sense; see the distinctions below.

English → Latin

“effectless” in Latin

invalidusinfirm, impotent, weak, feeble inūtilisuseless, unserviceable, unprofitable; hurtful, injurious; void, null, invalid, without any legal use sinewithout ūllusany efficiōto make out or work out; effect, execute, complete, accomplish, make, form, compose; to cause to occur, to bring about, valeōto have strength, influence, power; to avail; to be well, healthy, sound; to be worth, be worthy irritusinvalid, void, null and void; ineffective, useless, irrelevant

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

effectless

sine (ullo) effectu: invalidus (opposed to fortis, valens, of medicines): inutilis. To be effectless (of things), irritum or frustra esse.

Quick answer

What is the Latin word for effectless?: The usual Latin words for “effectless” are invalidus, inūtilis, sine; also ūllus, efficiō, valeō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.