せいぜい・精々・精精seizei[1]atamadaka (head-high)

1. adverbat the most; at best
   桜さくらの花はなは数すう日じつ、せいぜい一いち週間しゅうかんしか持もたない。↗

   Cherry blossoms last only for a few days, a week at the most.
2. adverbto the utmost; as much as possible; as much as one can
   狭せまい部屋へやをせいぜい広ひろく使つかった。↗

   I made the best of my small room.

• SynonymたかがCasualColloquial. Means 'at most, nothing more', as in 「たかが風邪だ」; it carries a dismissive, belittling tone.
• RelatedなるべくNeutralNeutral. Means 'as much as possible', as in 「なるべく早く」; it has only this sense, never the 'at most' sense of 「精々」.
• Related努めてつとめてWrittenWritten/formal prose. Means making a conscious effort, as in 「努めて冷静に振る舞う」; the point is deliberate, intentional striving.
• Related可及的かきゅうてきWrittenWritten/formal prose. Means 'as ... as possible' and is found mainly in official documents such as 「可及的速やかに」.
• RelatedなるたけCasualColloquial. Synonymous with 「なるべく」 and meaning 'as much as possible'; the expression itself sounds rather old-fashioned.

Use 「精々」 for 'at most' or for doing your utmost. For 'as much as possible' say 「なるべく」; for a dismissive 'at most' use 「たかが」; in official documents write 「可及的」.

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

1. 努つとめ、励はげむこと。尽力じんりょくすること。
2. （「〜がせいぜいだ」などの形かたちで）ようやっとのこと。どうにかたどりつく限界げんかい。
3. 精一杯せいいっぱい。最大限さいだいげん。
4. 多おおくは期待きたいしないがまあできる範囲はんいで。
5. 多おおくても。たかだか。
6. ようやっと。どうにか。