lonely, solitary
仃 centers on being alone and without company: lonely or solitary. The meanings are closely linked to a state of isolation.
仃 combines the person radical 亻 with 丁, which likely contributes a phonetic element. The exact historical development is uncertain, but the character is associated with the idea of a solitary person.
A person 亻 standing alone next to a nail-like shape 丁, like someone isolated and lonely with only a nail for company.
For テイ, imagine a solitary person sipping tea (テイ) alone: tea -> テイ, and the person is lonely.
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