velleity

Example:The taint of his personal problems tainted his decision-making skills.

Definition:a condition of being weakened or spoiled; a flaw or blemish that lowers the quality of something; a slight or unimportant quality or tendency that can undermine the purity or strength of a concept, emotion, or decision.

Example:The whole project had a shadiness about it that made the team hesitant to proceed.

Definition:a state of being questionable or morally questionable; suggesting that something is not quite right or is potentially wrong, often due to a lack of transparency or clear intentions.