Seem
Definition 1 of 4
Pro Tip 1/3
Impression Sensing
Seem is used when you sense something but lack confirmation. The sky seems cloudy, but I'm not sure if it'll rain.
Pro Tip 2/3
Not Certain
'Seem' implies uncertainty, it doesn't confirm the fact. You seem tired, but I might be wrong.
Pro Tip 3/3
Observation Based
Use 'seem' when making judgments based on observations. This task seems difficult, given our current resources.