unreliable

play
adjective un·re·li·able \ ˌən-ri-ˈlī-ə-bəl \

Definition of unreliable

:not reliable :undependable, untrustworthy
  • an unreliable friend
  • an unreliable source of funding
  • an unreliable car

unreliability

play \ˌən-ri-ˌlī-ə-ˈbi-lə-tē\ noun
    • the unreliability of the data
    • a person with a reputation for unreliability

unreliably

play \ˌən-ri-ˈlī-ə-blē\ adverb
    • a method that works unreliably

Recent Examples of unreliable from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unreliable.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of unreliable

1810


UNRELIABLE Defined for Kids

unreliable

adjective un·re·li·able \ ˌən-ri-ˈlī-ə-bəl \

Definition of unreliable for Students

:not worthy of trust He got rid of his unreliable car.


Seen and Heard

What made you want to look up unreliable? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to curse or denounce

Get Word of the Day daily email!

Test Your Vocabulary

Merriam-Webster's New Words Quiz—Fall 2017 Edition!

  • young-plant-shoots
  • Which of the following is a new sense of the word bunny?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!