✅ Watchful refers to being vigilant and alert and suggests that you expect something to happen (a watchful, cautious kind of person).

✅ Suspicious refers to not trusting people or assuming that something negative, illegal, or strange will happen (He was suspicious and always expected the worst of people).

✅ Both terms describe keeping your eye on someone or something because you suspect that something might happen.

✅ Watchful suggests observing and monitoring people or things, whereas suspicious suggests believing that a person is up to no good (He was suspicious of every person who drove through the neighborhood; She was watchful and knew everyone’s secrets).

✅ Sleepy refers to being tired or drowsy (I felt too sleepy to go out).

✅ Lethargic refers to being sluggish or lacking energy (I always feel lethargic before my morning coffee).

✅ Sometimes, when feeling sleepy, you might also feel lethargic. However, lethargic doesn’t necessarily mean that you’re tired.

✅ Instead, lethargic might suggest feeling ill or run-down or lacking energy and enthusiasm (I always feel lethargic in winter).

✅ Endurance refers to the ability to continue or last in adverse conditions (They showed great endurance in remaining positive through hard times).

✅ Vitality refers to the ability to survive, particularly while remaining viable or meaningful (It’s important to support the vitality of our town).

✅ Both these terms refer to the ability to survive.

✅ In this sense, vitality is often used of things, like institutions and languages, whereas endurance can be used to refer to people.