Infectious
10 lettersadjectivecommonUpdated June 2026
Definition
Capable of being transmitted from one person or organism to another through various means. Can also describe something that spreads rapidly or influences others, such as enthusiasm or laughter.
“Her infectious laughter soon had everyone in the room smiling.”
Pronunciation
IPA
/ɪnˈfɛk.ʃəs/
Syllables
in·fec·tious
Related Words
Synonyms
Antonyms
Word Game Tips
Wordle
10-letter medical/social term ending in -OUS; contains F and C
Scrabble
Worth 18 points; high-value letters F and C boost the score
Words Related to Infectious
Words one letter different
Change a single letter of “infectious” to make these 10-letter words — useful for Wordle and crossword clues.
Explore Similar Words
Try These Tools
Dictionary References
Look up infectious in an authoritative dictionary for full definitions, pronunciation, and etymology.

Ready to test your word skills?
Download Word Challenge for unlimited word puzzles, a fresh Daily Challenge, and head-to-head multiplayer. Guess the hidden word in six tries or fewer!