This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 怟 is uncertain. It visually combines 忄 (heart) with 氐, but the original role of 氐 here is unclear.
With 忄 (heart) beside 氐, imagine a heart that is low or base, but since the meaning is uncertain, treat this as a placeholder.
For テイ, picture a tea (ティー) cup held by a heart (忄) that is uncertain: tea -> テイ.