16 strokes
                                                    
                        Jouyou kanji
            Taught in 8th grade
    
                                                    JLPT exam level N1
                                            fervent, kind, cordial, serious, deliberate
Kun'yomi
- あ - つ - い - thick ②kind ③serious (of an illness) ④abundant 
On'yomi
- トク 
Character Breakdown
fervent, kind, cordial
トク あつ.い (8th, N1)
bamboo
たけ チク たか (1st, N2)
References
| Unicode hex code | 7BE4 | 
| JIS X 0208 | 1-38-38 | 
| Nelson, A. Classic Nelson | 3434 | 
| Haig, J. New Nelson Japanese-English Character Dictionary | 4342 | 
| Halpern, J. New Japanese-English Character Dictionary | 2716 | 
| Halpern, J. Kodansha Kanji Dictionary | 3371 | 
| Halpern, J. Kanji Learners Dictionary (Kodansha) | 1744 | 
| Halpern, J. Kanji Learners Dictionary (Kodansha), 2nd edition (2013) | 2370 | 
| Heisig, J. Remembering The Kanji | 1988 | 
| Heisig, J. Remembering The Kanji, Sixth Ed. | 2142 | 
| Gakken A New Dictionary of Kanji Usage | 1749 | 
| O'Neill, P.G. Japanese Names | 2576 | 
| O'Neill, P.G. Essential Kanji | 1561 | 
| Morohashi Daikanwajiten | 26344 | 
| Henshall, K. A Guide To Remembering Japanese Characters | 1666 | 
| Spahn and Hadamitzky Kanji and Kana | 1883 | 
| Spahn and Hadamitzky Kanji and Kana (2011 edition) | 2051 | 
| Hodges & Okazaki Japanese Kanji Flashcards | 1607 | 
| Kask, A. Tuttle Kanji Cards | 1842 | 
| Nishiguchi & Kono Kanji in Context | 1683 | 
| Kodansha Kodansha Compact Kanji Guide | 1489 | 
| Maniette, Y. Les Kanjis dans la tete | 2007 | 
| Tuttle Dictionary Descriptor Code | 6f10.1 | 
| Four corner code | 8832.7 | 
| De Roo Code | 2350 |