か兼kaねるneru
1.
To fulfill multiple roles or responsibilities simultaneously, effectively combining two or more functions or duties into one, often beyond the primary obligation.
2.
To face a difficulty or hesitation in taking action, indicating a sense of reluctance or inability to proceed due to external circumstances or considerations.
Example:
こういう事情ですから、残念ながら、せっかくのご招待をお受けいたしかねるのです。