one-handed

Short definition from Wiktionary

Adjective

1. 1
   Having only one hand.
2. 2
   Performed using only one hand.
3. 3
   Designed for use with one hand
4. 4
   Designed for use with one hand: Pornographic in nature.
5. 5
   That uses one hand.
6. 6
   Involving the actions of only one person.
7. 7
   Chiral, having an asymmetric structural orientation.

Adverb

1. 1
   Using only one hand; one-handedly.
2. 2
   Using only one hand; one-handedly: While masturbating.
3. 3
   Very easily, without effort.