Tap I know it only if you could say what the word means. Some words are made up — they are there to catch guesses.
penetrate
Connection lost. Reload to carry on — your earlier answers are kept.
Word lists: CEFR-J Wordlist v1.6 (Yukio Tono, Tokyo University of Foreign Studies) · Octanove Vocabulary Profile C1/C2 (CC BY-SA 4.0)