Use 'atonic' to describe extreme tiredness, much more than just being sleepy or lazy.

Physical Weakness

'Atonic' can imply a sense of helplessness or inability to act due to lack of energy.

Emotional Nuance

'Atonic' is not a word you'll hear often; it's more specific and less common than 'tired'.

In medical contexts, 'atonic' refers specifically to muscles, indicating a pathological weakness.

Medical uses of 'atonic' are highly technical and not used in everyday conversation.

'Atonic' in medical terms means lacking tone, not just being weak, which indicates a more severe condition.

'Atonic' in linguistics points to syllables that you say more quietly and quickly, without emphasis.

Understanding 'atonic' can help you grasp the rhythm and accent patterns of English pronunciation.

Misplacing the stress in words can change meaning, so identifying atonic parts is crucial.