Likely derived from root verb form sugu. The expected adjectival or adverbial form would be sugi, but there is evidence for sugu used in this way in ancient eastern dialects.
Notably, the modern verbs 過ぎる (sugiru) and 挿げる (sugeru) derived from sugu (see further below) have shared underlying senses of “going through; directly; without stopping or turning”, indicative of this common root.
- 直ぐ: immediately, right away, soon
- sugu iku yo
- I'll be there right away.
- 直ぐ: quick to
- sugu okoru
- quick to anger
- 直ぐ: right next to, right close by
- sugu ue ni
- right on top
- Konbini wa sugu soko da yo.
- The convenience store is right over there.
- すぐに (sugu ni): immediately; directly
- すぐと (sugu to): immediately; directly
- 真っ直ぐ (massugu): straight; straightforward, honest
The reading of various kanji terms.
- (obsolete) 過ぐ: classical form of modern 過ぎる (sugiru, “to go through, to go past; to exceed”)
- (obsolete) 挿ぐ: classical form of modern 挿げる (sugeru, “to connect or affix one thing to another, especially by passing something through something else”)
すぐ (romaji sugu)