efficaciously

adv

"efficaciously" is a 13-letter English headword indexed on PlainSpell.

The verdict

“efficaciously” is uncommon English (outside the top frequency list), classed as an adverb. The kind of spelling people second-guess.

Unranked
below top-frequency English
13
letters

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - in an efficacious manner

Corpus desk

Index EN-efficaciously · efficaciously · English

efficaciously · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-MEGA 13 letters
  • VOW-7 7 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-THIN "E" thin
  • PHOTO-UNK Peer pending

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Key facts for efficaciously
PropertyValue
Headwordefficaciously
LanguageEnglish
Part of speechAdverb
Letters13
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “efficaciously” in English

efficaciouslysits beyond the 100,000 most-frequent English words, in the long tail of technical, archaic, or otherwise rare vocabulary where spelling doubt tends to strike hardest.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

efficaciously is uncommon English outside the top frequency list, classed as anadverb. Rarity is why readers land here mid-draft. Gloss: "in an efficacious manner".

efficaciously has no tracked misspelling variants, a straightforward case of a spelling with little room for common typos. No confusable counterpart is on file for this word, since its spelling is unusual enough that it doesn't cluster with a lookalike.

Etymologically, the entry records: From efficacious + -ly. The correct English form is efficaciously, spelled E-F-F-I-C-A-C-I-O-U-S-L-Y.

Definition

  1. 1
    in an efficacious manner

Recorded use

Wiktionary examples

These source excerpts show how efficaciously appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. […] if in this extatick State of Dreaming (during which the Astral Impulses are incomparably stronger than in common Dreams, or in the ordinary Course of Life) that prophetick Energy more efficaciously exerts itself […]
  2. There could be no more perfect description of the divided will, when the higher wishes lack just that last acuteness, that touch of explosive intensity, of dynamogenic quality (to use the slang of the psychologists), that enables them to burst their shell, and make irruption efficaciously into life and quell the lower tendencies forever.

Etymology

From efficacious + -ly.

This word in other languages

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "efficaciously"?
"efficaciously" is spelled E-F-F-I-C-A-C-I-O-U-S-L-Y.
What does "efficaciously" mean?
As an adverb, "efficaciously" means: in an efficacious manner
What is the origin of the word "efficaciously"?
From efficacious + -ly. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list