1.
great, remarkable, admirable
Worthy of admiration for achievements or status.
2.
important, high-ranking
Having high social or professional status.
偉い is an i-adjective with multiple meanings depending on context.
FORMS:
- Adverb: 偉く (very, awfully - colloquial)
- Noun form: 偉さ (greatness)
MEANING 1 - ADMIRABLE:
- 偉い人: a great/admirable person
- 偉いね!: Good job! Well done! (praise)
MEANING 2 - HIGH-RANKING:
- 偉い人: an important/high-ranking person
- お偉いさん: bigwig, VIP (slightly sarcastic)
MEANING 3 - COLLOQUIAL INTENSIFIER:
- 偉く疲れた: I'm really tired
- 偉い目に遭った: I had a terrible experience