foolish, fear
怐 centers on a mind clouded by foolishness or fear, where clear thinking is lost.
怐 combines the heart radical 忄 with 句, which likely contributes the sound. The exact historical development is uncertain, but the character appears to express mental states related to foolishness or fear.
The heart radical 忄 beside 句 suggests a heart that is bound or crooked, leading to foolish thoughts or fearful feelings.
For ク, imagine a foolish person saying 'coo' like a pigeon out of fear: coo -> ク, and the heart is too scared to think straight.
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