'Wise' is related to 'Clever' in the same way as 'Lethargic / Lifeless ' is…

This is a synonym-based word analogy: the first pair — 'Wise' and 'Clever' — are two words carrying nearly the same meaning (both describe an intelligent, mentally sharp person). To complete such an analogy, the missing word must share the same core meaning as the second stem term, not merely its general theme.

'Lethargic' and 'Lifeless' both describe someone drained of energy and unwilling to exert effort — a state of dullness or inactivity. Among the given options, 'Lazy' carries exactly this meaning: an unwillingness to work or move, i.e., low energy and inactivity. This mirrors the Wise-Clever relationship precisely — the same core meaning expressed in different words.

The remaining options sit in a different dimension altogether — intelligence, not energy or vitality:

• Foolish — describes a lack of sense or intelligence; the opposite quality of 'wise', not a match for the low-energy sense of 'lethargic/lifeless'.

• Cunning — describes being clever in a sly, deceptive way; still an intelligence-related trait, unrelated to energy or vitality.

• Idiot — denotes a very unintelligent person; the same intelligence dimension as 'Foolish', not energy-related.

Hence, 'Lazy' is the word that completes the synonym analogy, matching 'Lethargic / Lifeless' the same way 'Clever' matches 'Wise'.