unfaithfully

1 5.0

In a way that shows no loyalty and breaks promises

adverb
/ʌnˈfeɪθfəli/

: deslealmente

She felt unfaithfully towards her partner after starting a new relationship.

Examples

He unfaithfully betrayed his best friend by sharing his secrets.
"Unfaithfully, Joan."

Song of the Thin Man (1947)
The employee acted unfaithfully by stealing from the company.

Synonyms

treacherously

vsunfaithfully

1 7.6

To break someone's trust by betraying them

focuses more generally on lacking loyalty trustworthiness or reliability

faithlessly

vsunfaithfully

7.4

In a way that breaks someone's trust

also covers lack of reliability as well as loyalty and trust

perfidiously

vsunfaithfully

Formal

9.9

In a dishonest way that betrays trust

describes general lack of loyalty or reliability rather than deceit

untrustworthily

vsunfaithfully

8.1

In a dishonest or unreliable way

also implies lack of loyalty in addition to missing trust or reliability

traitorously

vsunfaithfully

9.2

In a way that is not loyal and harms people who trust you

is broader covering any lack of trustworthiness or general unreliability

disloyally

vsunfaithfully

6.0

In a way that does not support someone who trusts you

covers lack of trustworthiness and reliability not only missing loyalty

Antonyms

faithfully

54 2.6

In a loyal, reliable, or exact way

loyally

7 2.5

In a way that shows strong support for someone or something

How Loyal

devotedly

1 3.6

faithfully

54 2.6

loyally

7 2.5

unfaithfully

1 5.0

disloyally

6.0

treacherously

1 7.6

Surface Forms

unfaithfully positive

Morphology

unfaithfully = unfaithful (transparent) = un + faith + ful + ly

Forming an adverb with the productive suffix '-ly' from the adjective 'unfaithful' is a clear and regular derivation.

Etymology

The word unfaithfully is made from un- ('not') and faithful, which comes from faith ('trust' or 'belief') and means 'loyal'. So unfaithfully means acting 'not loyal' or 'not keeping someone's trust'.