When describing an action that happens "without" someone else doing something—like leaving without someone noticing, or working without the boss intervening—Italian uses the conjunction senza che.
| without (+ clause) | senza che |
Because senza che introduces an action that is explicitly not happening (or is actively avoided), it triggers the subjunctive in the dependent clause.
| I leave the room without him noticing. | Esco dalla stanza senza che lui se ne accorga. |
| He leaves without his father giving him permission. | Parte senza che suo padre gli dia il permesso. |
Permission and Interference
This structure is extremely common when talking about acting without someone's permission, interference, or knowledge. Notice how the subject changes between the two halves of the sentence: one person acts without another person intervening.
| We can proceed without the boss intervening. | Possiamo procedere senza che il capo intervenga. |
| I do everything without him interfering. | Faccio tutto senza che lui interferisca. |
| We must act without the director preventing it. | Dobbiamo agire senza che il direttore lo impedisca. |
Senza vs. Senza che
Remember that senza che is a conjunction used to introduce a new clause with a conjugated verb. To say "without" followed by a noun (like "without consent"), use the preposition senza.
| I do not intervene without your consent. | Non intervengo senza il tuo consenso. |
| The situation is terrible without his approval. | La situazione è terribile senza la sua approvazione. |