145. Erudite, Learned

Erudite: Having deep knowledge
Learned: Highly educated

146. Ethereal, Delicate

Ethereal: Light and airy
Delicate: Fragile

147. Exculpate, Exonerate

Exculpate: Clear from blame
Exonerate: Free from guilt

148. Exigent, Urgent

Exigent: Requiring immediate action
Urgent: Needing prompt attention

149. Exorbitant, Excessive

Exorbitant: Unreasonably high
Excessive: Too much

150. Expunge, Delete

Expunge: Remove completely
Delete: Erase

151. Facetious, Flippant

Facetious: Treating serious issues lightly
Flippant: Lacking seriousness

152. Fallacious, Misleading

Fallacious: Based on false reasoning
Misleading: Giving a wrong impression

153. Fatuous, Silly

Fatuous: Foolish and pointless
Silly: Lacking seriousness

154. Feckless, Ineffectual

Feckless: Lacking initiative
Ineffectual: Not producing results

155. Felicitous, Apt

Felicitous: Well-suited
Apt: Appropriate

156. Ferocious, Fierce

Ferocious: Violently aggressive
Fierce: Intense and strong