mellow vs perfective aspect

mellow

noun
  • A comfortable or relaxed mood. 

  • The property of being mellow; mellowness. 

  • Also main mellow: a close friend or lover. 

verb
  • To cause (food or drink, for example, cheese or wine, or its flavour) to become matured and smooth, and not acidic, harsh, or sharp. 

  • To reduce or remove the harshness or roughness from (something); to soften, to subdue, to tone down. 

  • To mature and lose its harshness or sharpness. 

  • Followed by out: to relax (a person); in particular, to cause (a person) to become pleasantly high or stoned by taking drugs. 

  • To cause (fruit) to become soft or tender, specifically by ripening. 

  • To relax; in particular, to become pleasantly high or stoned by taking drugs. 

  • To be rendered soft and suitable for planting in. 

  • To cause (a person) to become calmer, gentler, and more understanding, particularly from age or experience. 

  • To lose harshness; to become gentler, subdued, or toned down. 

  • To soften (land or soil) and make it suitable for planting in. 

  • To cause (a person) to become slightly or pleasantly drunk or intoxicated. 

adj
  • Soft and easily penetrated or worked; not hard or rigid; loamy. 

  • Pleasantly high or stoned, and relaxed after taking drugs; also, of drugs: slightly intoxicating and tending to produce such effects. 

  • Fruitful and warm. 

  • Matured and smooth, and not acidic, harsh, or sharp. 

  • Pleasing in some way; excellent, fantastic, great. 

  • Cheerful, genial, jovial, merry; also, easygoing, laid-back, relaxed. 

  • Soft or tender by reason of ripeness; having a tender pulp. 

  • Mature; of crops: ready to be harvested; ripe. 

  • Not coarse, brash, harsh, or rough; delicate, rich, soft, subdued. 

  • Well-matured from age or experience; not impetuous or impulsive; calm, dignified, gentle. 

  • Drunk, intoxicated; especially slightly or pleasantly so, or to an extent that makes one cheerful and friendly. 

perfective aspect

noun
  • A feature of the verb which denotes viewing the event the verb describes as a completed whole, rather than from within the event as it unfolds. For example, "she sat down" as opposed to "she was sitting down". Since the focus is on the completion of what is expressed by the verb, this aspect is generally associated with the past and future tenses. This term is often used interchangeably with aorist aspect. This is not to be confused with the perfect tense. 

How often have the words mellow and perfective aspect occurred in a corpus of books? (source: Google Ngram Viewer )