だけでなく (dake de naku)

Related patterns8

Similar

ばかりでなく
Same "not only X" wording, だけでなく works in speech and writing. ばかりでなく leans written and formal, and sounds stiff in casual chat.
まで
だけでなく names both things evenly. まで adds the surprising extra one, so they often pair up (電車でんしゃだけでなくバスまで).
も〜ば〜も
だけでなく treats the second half as the real point, the one worth stressing. も〜ば〜も treats both halves as equally weighted.
に加くわえて
に加くわえて is the neutral written choice, adding one more fact with no surprise (基本きほん給与きゅうよに加くわえて、交通こうつう費ひも支給しきゅうする). だけでなく instead stresses "not just X, Y too," and fits casual speech (安やすいだけでなく味あじもいいんだよ).
のみならず
だけでなく is neutral, and the normal choice in speech (これだけでなく). のみならず is old-fashioned and belongs in writing, like editorials (会員かいいんのみならず).
はもちろん
だけでなく weighs both items evenly, claiming neither is obvious. はもちろん instead grants the first, putting all the news in the second.

Lookalikes

Same meaning14

only; nothing but

ばかりnothing but; only everattaches at
ばかりでなくnot only ... (but also)attaches at
だけonly; justattaches at
でしかないis nothing but; amounts to no more thanattaches at
以外いがいother than; except forattaches at
に限かぎってof all times/people — ironic bad luck, or a total denialattaches at
に過すぎないis no more than; merelyattaches at
のみonly; nothing but (written)attaches at
抜ぬきでwithout X; leaving X outattaches at
を除のぞいてwith the exception of; excludingattaches at
さえeven N (weaker cases hold too)attaches at
さえ〜ばif only ...; all it takes is ...attaches at
しか〜ないnothing but; no more than (with negative)attaches at
てばかりいるdoes nothing but do X (habitual excess, disapproving)attaches at

All examples6

not only N — adds more than the noun named, usually with も

彼かれは英語えいごだけでなくフランス語ごも話はなせます。
kare wa eigo dake de naku furansugo mo hanasemasu.
He can speak not only English but French as well. neutral
この店みせ、安やすいだけでなく味あじもいいんだよ。
kono mise, yasui dake de naku aji mo ii n da yo.
This place isn't only cheap — the food's good too. casual
今回こんかいのセミナーは学生がくせいだけでなく社会人しゃかいじんの方かたにもご参加さんかいただけます。
konkai no seminaa wa gakusei dake de naku shakaijin no kata ni mo go sanka itadakemasu.
This seminar is open to working professionals as well, not just students. formal

not only X — a whole verb or adjective, not a noun

この漫画まんが、面白おもしろいだけでなく、勉強べんきょうにもなるんだ。
kono manga, omoshiroi dake de naku, benkyou ni mo naru n da.
This manga isn't only entertaining — it's actually educational too. casual
この機械きかいは使つかいやすいだけでなく、値段ねだんも手頃てごろです。
kono kikai wa tsukaiyasui dake de naku, nedan mo tegoro desu.
This machine isn't only easy to use — it's reasonably priced too. neutral
本製品ほんせいひんは高性能こうせいのうなだけでなく、省しょうエネルギーでもございます。
honseihin wa kouseinou na dake de naku, shouenerugii de mo gozaimasu.
This product is not only high-performance, but energy-efficient as well. formal

How it's formed3

All forms2

だけではなくdakedehanakuformal
味あじわうだけではなく
inserts topic は for a fuller, more explicit negation — reads slightly stiffer/written, the safer pick in reports and announcements
だけじゃなくてdakejanakutecolloquial
味あじわうだけじゃなくて
では→じゃ is the everyday spoken contraction, plus て to run into what follows — the real casual choice, more natural than bare だけでなく in brisk conversation

Notes

Almost always resolves with も／でも on the second half (…だけでなく…も);
a bare だけでなく with nothing added back sounds unfinished, much like
によると without a hearsay ending.