| grundform | tankefel |
| mönster | nn_6n_departement |
| ordklass | nn |
| inherenta drag | n |
| böjningstabell | |
| sg indef nom | tankefel |
| sg indef gen | tankefels |
| sg def nom | tankefelet |
| sg def gen | tankefelets |
| pl indef nom | tankefel |
| pl indef gen | tankefels |
| pl def nom | tankefelen |
| pl def gen | tankefelens |
| ci | tankefels/tankefels- |
| cm | tankefels/tankefels- |
| sms | tankefels- |