be doubtful whether

Popularity
500+ learners.
We do not have example sentences for to be doubtful whether in English. Please check your spelling or try searching for similar words or phrases. Click here to see a translation instead.
Random Word
Roll the dice and learn a new word now!
Get a Word
Want to Learn Spanish?
Spanish learning for everyone. For free.
Translation
The world’s largest Spanish dictionary
Conjugation
Conjugations for every Spanish verb
Vocabulary
Learn vocabulary faster
Grammar
Learn every rule and exception
Pronunciation
Native-speaker video pronunciations
Word of the Day
hervir
to boil
Word of the Day
to boil
hervir
SpanishDictionary.com is the world's most popular Spanish-English dictionary, translation, and learning website.
FEATURES
Translation
Conjugation
Vocabulary
Learn Spanish
Grammar
Word of the Day
ABOUT
About Us
Privacy
Terms
Site Map
Help
Contact Us
SOCIAL NETWORKS
Facebook
X
X
Instagram
APPS
Apple
iOS
Android
Android
IXL learning logo
Dictionary Media Group logo

IXL Learning's Dictionary Media Group reaches over 500,000,000 learners each year.

French-English dictionary, translator, and learning

English dictionary and learning for Spanish speakers

English dictionary and learning for French speakers

Comprehensive resource for word definitions and usage

Essential reference for synonyms and antonyms

Comprehensive K-12 personalized learning

Adaptive learning for English vocabulary

Immersive learning for 25 languages

Marketplace for millions of educator-created resources

35,000+ worksheets, games, and lesson plans

Fun educational games for kids

Fast, easy, reliable language certification

Trusted tutors for 300+ subjects

Bite-sized daily word games

Playful tools to learn multiplication

Copyright © 2026 Dictionary Media Group, Inc., a division of IXL Learning • All Rights Reserved.