What do the unchecked messages in WhatsApp mean when they don't turn blue?

What do the unchecked messages in WhatsApp mean when they don't turn blue - briefly?

Unchecked messages in WhatsApp that do not turn blue indicate that the recipient has not yet read or opened the message. This status is commonly referred to as "unread" and provides senders with an understanding of message delivery but not receipt confirmation.

What do the unchecked messages in WhatsApp mean when they don't turn blue - in detail?

Unchecked messages in WhatsApp, which do not turn blue, indicate that the message has been sent but not yet delivered to the recipient. This status is represented by a single gray checkmark next to the message. The absence of a blue double-checkmark signifies that the recipient's device has not yet received the message, possibly due to several reasons including network connectivity issues, the recipient's phone being turned off or on airplane mode, or the recipient not having WhatsApp installed. Once the message is successfully delivered and read by the recipient, the checkmarks will turn blue, providing confirmation of delivery and receipt.