advertisement

educational tools / words / words of the day

PSAT / SAT Prep

Wednesday, September 17
perfidious adj.

Definition: deliberately faithless; treacherous; deceitful.

Synonyms: dishonest, corrupt

See yesterday's word

Want more words? Get the app!

advertisement

advertisement

Contents

math worksheets

math tips

word of the day by grade level

vocabulary games

other educational tools

learning insights, research & ideas

logic games

Shakespeare

quote of the day

feature articles

ask a scientist

educational software reviews

iPhone apps

recommended books

useful links

humor

SuperKids info

top of page

home

about SuperKids

advertise

errata

privacy policy

link to us

contact us

Free education tools, tips, games, reviews & insights. Since 1996.

© 2025 Knowledge Share LLC. All rights reserved.