IPA: /ˌɪnkənˈtroʊləbəl/
KK: /ɪnˌkɒntrəˈloʊbəl/
Something that cannot be controlled or managed.
The child's incontrollable laughter filled the room with joy.
Comparative: more incontrollable
Superlative: most incontrollable
Incontrollable → It is formed from "in-" (meaning not) and "controllare" (meaning to check or restrain). The word describes something that cannot be checked or restrained, hence uncontrollable.
Think of something that cannot be 'checked' or 'restrained' — 'in-' means not, and 'controllare' means to control.