2 syllables: Le, thal. Stress on Le.
LEE-thuhl
/ˈliθəl/
Lethal is pronounced LEE-thuhl (/ˈliθəl/). It has two syllables (Le-thal), with the stress on "Le". Lethal is an adjective describing something that can cause death or is capable of causing death. It characterizes danger or severity to the point of being life-threatening, often used in medical, legal, or safety contexts. The term emphasizes the potential for fatal consequence rather than mere harm.
adjectiveLethal is an adjective describing something that can cause death or is capable of causing death. It characterizes danger or severity to the point of being life-threatening, often used in medical, legal, or safety contexts. The term emphasizes the potential for fatal consequence rather than mere harm.
"The toxin is highly lethal if ingested in small amounts."
"Researchers are studying a lethal combination of factors that could trigger a fatal outcome."
"She wore a weapon with lethal precision during the mission."
US/UK pronunciation: LE-thəl, with primary stress on the first syllable. The first vowel is a short /ɛ/ as in “let,” followed by a /ð/ voiced dental fricative, and a final /əl/ reduced to a schwa + l in rapid speech. IPA: US/UK /ˈlɛˌθəl/ or /ˈlɛθəl/ depending on transcription; ensure your tongue lightly contacts the teeth for the /ð/ sound. Audio reference: consult Cambridge/Oxford audio entries and Forvo for native realizations.
Common errors include substituting /ð/ with /d/ or /z/, turning /ˈlɛˌθəl/ into /ˈlɛdə/ or dropping the /ð/ entirely (e.g., /ˈlɛl/). Some speakers misplace voicing, producing a voiceless /θ/ or an aspirated /t/ instead of the true dental fricative. Correction: place the tongue tip gently between the upper and lower teeth and voice the /ð/ as in “this,” keeping a steady, non-aspirated flow. Follow with a clear /əl/ or /əl/ reduced in fast speech.
US and UK generally share /ˈlɛθəl/; US may reduce the second syllable more quickly to /-əl/, while some UK speakers retain a slightly longer /θəl/. Australian English often shows a mild reduction of the second syllable and can alter vowel quality slightly, but the dental fricative remains /ð/. Overall: stress on first syllable, with /ð/ central to the second syllable in all three varieties.
The critical challenge lies in the dental fricative /ð/ between two alveolar sounds, plus maintaining a short /ɛ/ before it. Many learners substitute /ð/ with /d/ or /z/, or misplace the tongue to produce a /θ/ or /t/ sound. Practicing with minimal pairs and slow, deliberate articulation helps: tell your tongue to touch the back of the upper front teeth while voicing. This reinforces accurate timing into the schwa + l cluster.
The pronunciation hinges on the dental /ð/ between the /ɛ/ vowel and the /əl/ tail. It’s common to hear learners flatten the /ð/ into /d/ or delay voicing. Pay close attention to voicing during the /ð/; you should feel a slight vibration as you place the tongue between teeth and voice the consonant, then move immediately into the /əl/ without an extra pause. IPA: /ˈlɛðəl/ (in careful speech) transitioning to /ˈlɛθəl/ depending on dialect.
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US: /ˈlɛðəl/ with a clear /ð/ and a mid-front vowel; UK: /ˈlɛθəl/ similar, sometimes a slightly tensed /ɪ/ or clearer /ð/; AU: /ˈlɛðəl/ or /ˈlɛθəl/ with slight vowel length variations and less rhoticity influence. Vowel height: keep /ɛ/ mid-open; /ð/ remains dental; /əl/ reduces to schwa + l in fast speech. IPA references: /ˈlɛðəl/, /ˈlɛθəl/.
Lethal comes from Old French lethalis, from Late Latin lethālis, from lethum ‘death’ (from Greek thlēsis ‘slaughter, death’). The root thlēsis is linked to the Greek word for death and ruin, with the broader Latin term letalis used to mean ‘death-causing.’ By the 16th century, English adopted lethal to describe agents or agents capable of causing death, evolving from a general sense of deadly, to a more specific descriptor for the power to cause death. Throughout its history, lethal has maintained its strong fatal connotation, expanding into figurative use (e.g., lethal weapon, lethal combination) to denote extreme potency. First known use in English appears in the 15th–16th centuries, aligning with the era’s increasing legal and medical vocabulary around poison, weapons, and fatal injuries.
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💡 These words have similar meanings to "Lethal" and can often be used interchangeably.
🔄 These words have opposite meanings to "Lethal" and show contrast in usage.
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Words that rhyme with "Lethal"
-eel sounds
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