different between serious vs deadly

English

Etymology

From Middle English seryows, from Old French serieux, from Medieval Latin s?ri?sus, an extension of Latin s?rius (“grave, earnest, serious”), from Proto-Indo-European *swer- (“heavy”). Cognate with German schwer (“heavy, difficult, severe”), Old English sw?r (“heavy, grave, grievous”). More at swear, sweer.

Pronunciation

• (General American) IPA^(key): /?s???.i.?s/, [?si??.i.?s]
• (Received Pronunciation) IPA^(key): /?s??.?i.?s/
• Rhymes: -???i?s
• Homophones: cereous, Sirius (one pronunciation)

Adjective

serious (comparative more serious or seriouser, superlative most serious or seriousest)

1. Without humor or expression of happiness; grave in manner or disposition

   It was a surprise to see the captain, who had always seemed so serious, laugh so heartily.

   Synonyms: earnest, solemn

2. Important; weighty; not insignificant

   This is a serious problem. We'll need our best experts.

3. Really intending what is said (or planned, etc); in earnest; not jocular or deceiving

   After all these years, we're finally getting serious attention.

   He says he wants to buy the team, but is he serious?

4. (of a relationship) Committed.

Synonyms

• See also Thesaurus:serious

Antonyms

• (important, weighty): trifling, unimportant
• (intending what is said): jesting

Derived terms

• srs (abbreviation)
• dead serious
• seriously
• seriousness
• serious-minded
• serious-mindedly
• serious-mindedness

Translations

Adverb

serious (not comparable)

1. (colloquial, dialect) In a serious manner; seriously.

Further reading

• serious in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• serious in The Century Dictionary, New York, N.Y.: The Century Co., 1911.

English

Etymology

From Middle English dedly, dedlych, dedlich, from Old English d?adl?? (adjective); corresponding to dead +? -ly. Cognate with Dutch dodelijk, German tödlich.

The adverb is from Middle English dedliche, from Old English d?adl??e (adverb), from the adjective.

Pronunciation

• IPA^(key): /?d?d.li/

Adjective

deadly (comparative deadlier or more deadly, superlative deadliest or most deadly)

1. (obsolete, rare) Subject to death; mortal.
2. Causing death; lethal.
3. Aiming or willing to destroy; implacable; desperately hostile.
4. Very accurate (of aiming with a bow, firearm, etc.).
5. (informal) Very boring.
6. (informal) Excellent, awesome, cool.

Usage notes

In Australia, the sense "excellent, awesome, cool" is especially used by, or in connection with, Indigenous Australians.

Derived terms

• deadliness
• deadly sin

Translations

Adverb

deadly (comparative more deadly, superlative most deadly)

1. (obsolete) Fatally, mortally.
2. In a way which suggests death.

3. Extremely, incredibly.

Usage notes

Some adjectives commonly collocating with deadly: serious, clever, good

Derived terms

• fail-deadly

Translations

Related terms

• dead