The word is in the Wiktionary

1 short excerpt of Wiktionnary (A collaborative project to produce a free-content dictionary.)

— English word —

unefficacious adj. Not efficacious.

2 English words from the English definition

efficacious Not

20 words-in-word (Words found as is inside the word. Minimum size 3 letters.)

ACI -acious CAC CIO eff EFF efficacious FFI fic FICA ICA -ica ICAC IOU IOUs -ious nef Neff ous -ous

14 words-in-word RTL (Words found written from right to left, inside the word. Minimum size 3 letters.)

ACI CAC CIF fen ICA -ica ICAC iff IFF iffen oic OIC -oic OIc.

One cousin (New word found by changing only one letter.)

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