different between dreadful vs deleterious

English

Alternative forms

• dreadfull
• dredful (obsolete)

Pronunciation

• IPA^(key): /?d??d.f?l/

Etymology

From Middle English dredful, dredfull, dredeful (also dreful), equivalent to dread +? -ful.

Adjective

dreadful (comparative more dreadful, superlative most dreadful)

1. Full of something causing dread, whether
   1. Genuinely horrific, awful, or alarming; dangerous, risky.
      • 1900, L. Frank Baum, The Wonderful Wizard of Oz, Chapter 23:

        "...Aunt Em will surely think something dreadful has happened to me, and that will make her put on mourning..."

   2. (hyperbolic) Unpleasant, awful, very bad (also used as an intensifier).
      • 1682, T. Creech's translation of Lucretius, De Natura Rerum, Book II, 52:

        Here some... Look dreadful gay in their own sparkling blood.
   3. (obsolete) Awesome, awe-inspiring, causing feelings of reverence.
2. (obsolete) Full of dread, whether
   1. Scared, afraid, frightened.
   2. Timid, easily frightened.
   3. Reverential, full of pious awe.

Adverb

dreadful (comparative more dreadful, superlative most dreadful)

1. (informal) Dreadfully.

Usage notes

The senses of "dreadful" synonymous with "afraid" similarly use the infinitive or the preposition "of": they were dreadful to build or the boy was dreadful of his majesty. These senses are, however, now obsolete.

When used as an intensifier, "dreadful" is actually a form of the adverb "dreadfully" and thus considered informal or vulgar.

Synonyms

• See Thesaurus:frightening
• See Thesaurus:bad

Derived terms

• dreadfully
• dreadfulness

Translations

Noun

dreadful (plural dreadfuls)

1. A shocker: a report of a crime written in a provokingly lurid style.
2. A journal or broadsheet printing such reports.
3. A shocking or sensational crime.

Derived terms

• penny dreadful

Further reading

• Oxford English Dictionary, 1884–1928, and First Supplement, 1933.

English

Etymology

From Medieval Latin deleterius, from Ancient Greek ?????????? (d?l?t?rios, “noxious, deleterious”), from ??????? (d?l?t?r, “a destroyer”), from ???????? (d?léomai, “I hurt, damage, spoil, waste”), 1640s.

Pronunciation

• (Received Pronunciation) IPA^(key): /?d?l??t???i.?s/, /?d?l??t???i.?s/
• (US) IPA^(key): /?d?l??t??i.?s/
• Rhymes: -??ri?s

Adjective

deleterious (comparative more deleterious, superlative most deleterious)

1. Harmful often in a subtle or unexpected way.

   Synonyms: destructive, harmful, hurtful, injurious, noxious, pernicious; see also Thesaurus:harmful
2. (genetics) having lower fitness.

Derived terms

• deleteriously
• deleteriousness

Related terms

• delete
• deletion
• deletory

Translations

Further reading

• deleterious at OneLook Dictionary Search
• deleterious in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• Douglas Harper (2001–2021) , “deleterious”, in Online Etymology Dictionary

References