* Watchful: Paying close attention to their surroundings, alert to danger.
* Protective: Standing guard, defending a place or person.
* Solemn: Serious and dignified, like someone fulfilling a crucial duty.
* Unmoving: Staying still and vigilant, like a sentinel.
Examples:
* "The old lighthouse, perched on the clifftop, stood sentrylike against the storm."
* "He had a sentrylike gaze, scanning the crowd for any sign of trouble."
* "Her posture was sentrylike, hands on her hips, ready to confront any challenge."
It's important to note:
* "Sentrylike" is not a commonly used word. You might encounter it in more formal or literary contexts.
* There are other words that can convey similar meanings: watchful, vigilant, guarded, defensive, etc.