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Erudite

Scholary

Gossamer

Thin fabric

Inscrutable

Incapable of being understood, impossible to see through physically

Irrevocable

Incapable of being called back

Propensity

A natural inclination

Querulous

Peevish, complaining, being a little bitch

Remonstrate

To argue or plead with someone against something

Repudiate

To disown, reject, or deny the validity of

Reverberate

To re echo or to reflect

Scurrilous

Coarsely abusive or foul mouthed

Sedulous

Persistent, showing determination