Woodlogos
Upper
ISEE Prep  /  Words  /  Upper  /  efficacious

efficacious

/ˌefɪˈkeɪʃəs/
ef · fi · ca · cious ˌef · ɪ · ˈkeɪ · ʃəs
English Definition
adj. effective; successful; potent
中文释义
有效的，奏效的
Significado en Español
eficaz, efectivo
한국어 뜻
효과적인, 유효한
Nghĩa Tiếng Việt
hiệu quả, có tác dụng
Show meaning in
Example Sentence

The medicine proved to be highly efficacious in treating the illness.

这种药物在治疗疾病方面被证明非常有效。

Synonyms
effective potent successful
💡
Memory Aid / 记忆技巧
ef-(out) + fic(do) + acious→ effective, having an effect.
Know this word? Mark it mastered, or move on.
← Previous Next →

Practice — Synonym (ISEE Verbal)

Select the word that is the closest synonym for “efficacious”: The new policy implemented by the school board proved to be highly efficacious in improving student attendance rates.

  1. A ineffective
  2. B useless
  3. C effective
  4. D harmful
Show answer

C — effective. “efficacious” means adj. effective; successful; potent

Practice — Sentence Completion (ISEE Verbal)

The new medicine proved highly ______ against the stubborn infection.

  1. A useless
  2. B ineffective
  3. C efficacious
  4. D harmful
Show answer

C — efficacious. “efficacious” means adj. effective; successful; potent

More Upper-level ISEE words

adorn commensurate ebb economical ecstatic eloquent elucidate emanate immaterial malicious progeny submissive

Common questions about “efficacious”

What does “efficacious” mean?

efficacious — adj. effective; successful; potent. In Chinese: 有效的，奏效的.

How do you pronounce “efficacious”?

efficacious is pronounced /ˌefɪˈkeɪʃəs/. It breaks into 4 syllables: ef · fi · ca · cious.

How do you use “efficacious” in a sentence?

The medicine proved to be highly efficacious in treating the illness. (这种药物在治疗疾病方面被证明非常有效。)

What are synonyms for “efficacious”?

effective, potent, successful — all close in meaning to efficacious (adj. effective; successful; potent).

Is “efficacious” an ISEE Upper-level word?

Yes. efficacious appears on the iSEE Vocab Upper list, which covers 804 words for the ISEE and SSAT.

How can I remember “efficacious”?

ef-(out) + fic(do) + acious→ effective, having an effect.

Progress / 学习进度
266 / 804
33% through this level
Mastered: 0 / 804 (0%)
⬇ Download the iSEE Vocab app to keep tracking your learning progress across sessions and devices. / 下载 iSEE Vocab App，持续跟进你的学习进度。
⬇ Download iSEE Vocab & keep learning / 下载 iSEE Vocab 继续学习