Lanky implies not just height and thinness, but also a lack of grace or coordination in one's movements. The lanky boy stumbled as he tried to navigate the crowded classroom.
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Neutral Tone
The word 'lanky' is neutral, not usually intended as a compliment or insult, but a simple observation. The lanky giraffe moved slowly towards the watering hole.
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Physical Appearance
'Lanky' often describes young people during growth spurts before they fill out. The lanky teenager grew three inches over the summer.