| 苦慮 | [くりょ, kuryo] (n, vs) rack one's brains; (P) [Add to Longdo] |
| 思いあぐねる;思い倦ねる | [おもいあぐねる, omoiaguneru] (v1) to think something over and over; to rack one's brains; to be at a loss [Add to Longdo] |
| 心を砕く | [こころをくだく, kokorowokudaku] (exp, v5k) to rack one's brains; to wrack one's brains [Add to Longdo] |
| 頭を捻る;頭をひねる | [あたまをひねる, atamawohineru] (exp, v5r) to puzzle over; to think deeply about; to wrack one's brains over [Add to Longdo] |
| 頭を悩ます | [あたまをなやます, atamawonayamasu] (exp, v5s) to rack one's brains [Add to Longdo] |
| 脳味噌を絞る | [のうみそをしぼる, noumisowoshiboru] (exp, v5r) to rack one's brains [Add to Longdo] |