めきめきmekimeki

1. adverb (with と)remarkably; markedly; rapidly
   タケシはめきめき数学すうがくの力ちからをつけている。↗

   Takeshi is making great progress with math.
2. adverb (with と)sound of breaking or creaking

• SynonymめっきりNeutralMarks a change that is clearly visible, typically a decline or a seasonal shift, as in 「めっきり寒くなった」; 「メキメキ」 is mostly about progress.
• RelatedずいぶんNeutralA degree adverb meaning 'quite' or 'very'; it states extent only and carries no sense of rapid growth.
• RelatedなかなかNeutralMeans 'quite good', or with a negative 'not easily'; unlike 「メキメキ」 it carries no sense of growth or progress.
• RelatedよほどNeutralMeans 'quite' or 'very', and in 「よほど…らしい」 it marks conjecture; it does not describe progress.
• AntonymだらだらNeutralSuggests dragging on endlessly or sluggishly — the opposite of improving rapidly.
• AntonymじりじりNeutralDescribes moving ahead slowly, little by little — the opposite of the rapid progress 「メキメキ」 depicts.

Use 「メキメキ」 for skills or ability improving rapidly, as in 「メキメキ上達する」. For a noticeable change, especially decline or the seasons, pick 「めっきり」. 「随分」「中々」「余程」 are degree adverbs with no growth sense; 「じりじり」 is slow steady progress and 「だらだら」 is dragging on.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 成長せいちょう・進歩しんぽなどが目立めだって早はやいさま。
2. 物ものがきしんだり割われたりする音おと。