AI-powered vocabulary practice

Turn your word list into a study session.

Lacuna writes memorable fill-in-the-blank questions from the words you need to learn—so you spend less time making flashcards and more time mastering them.

See an example
No credit card Your own word lists Progress saved

Today’s sprint

Literary vocabulary

3 of 12
QUESTION 03Medium

No plea, no tear, no appeal to reason could soften her obdurate refusal.

Nice work!Press enter to continue
inexorableobduratecopioussalient

How it works

From list to learned in three steps

No decks to format. No questions to write. Bring the words and start practicing.

  1. 01

    Drop in your words

    Paste a list or upload a CSV, TXT, or Excel file. Lacuna cleans it up automatically.

  2. 02

    Set the challenge

    Choose how much context you want, from generous clues to exam-level difficulty.

  3. 03

    Practice actively

    Type or drag each answer into place and get immediate, useful feedback.

Real examples

Context that makes new words click.

Every sentence is written around the meaning of your word. Easy mode gives stronger clues; hard mode makes you work for it.

Active recall, not passive review
1 Answer revealed

The undertaker’s lugubrious face suited his profession; even at christenings he looked ready to weep.

2 Answer revealed

The patrol stumbled into an ambuscade as they rounded the narrow mountain pass, with enemy fighters on every side.

3 Answer revealed

No plea, no tear, no appeal to reason could soften her obdurate refusal.

🎯

Built around your class

Study the exact words from your reading, lecture, or exam guide—not a generic deck.

📈

Feedback you can use

See your accuracy, mastery, and session count so you always know what is sticking.

⚡

Practice without friction

Works with typing or drag-and-drop on any device. Your place is saved automatically.

✦

Your next word list is waiting.

Create your first practice set in under a minute. Start with five free generations—no card required.