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Definitions

diehard

[dahy-hahrd] / ˈdaɪ hɑrd /
NOUN
overenthusiastic person
Synonyms
STRONGEST
fanatic fundamentalist zealot
STRONG
bourbon extremist fogy mossback praetorian pullback reactionary right right-winger rightist stick-in-the-mud ultraconservative
WEAK
bitter ender dyed-in-the-wool intransigent old liner standpat standpatter true blue

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“I’m more than worried. I’m nervous. I’m scared,” said Tavárez, born in Los Angeles to parents from Jalisco and a diehard fan of the Mexican national team.

From Los Angeles Times • Feb. 25, 2026

As for everyone else, including her most diehard critics, she hopes they can still appreciate her fiction.

From The Wall Street Journal • Jan. 31, 2026

That’s because most of the news stories about this box set completely buried the lede, and I had to wait for a diehard fan to post about it.

From Salon • Dec. 9, 2025

The Athletic added in a Friday report that the two negotiators “remain far apart” on their respective demands, frustrating the YouTube TV viewers who make up “some of the most diehard NFL fans anywhere.”

From Slate • Nov. 10, 2025

I imagine that some of you, particularly those who are diehard cola drinkers, are bristling at this point.

From "Blink" by Malcolm Gladwell