ponderous meaning
EN
[ˈpɒn.dəɹ.əs] [ˈpɑn.dɚ.əs] 
US - AdjectiveCOMmore ponderousSUPmost ponderousSUF-ous
- Heavy, massive, weighty.
- (figuratively, by extension) Serious, onerous, oppressive.
- Clumsy, unwieldy, or slow, especially due to weight.
- Dull, boring, tedious; long-winded in expression.
- (rare) Characterized by or associated with pondering.
- (obsolete) Dense.
- Heavy, massive, weighty.
- More Examples
- Used in the Middle of Sentence
- These are ponderous flat stones with long ropes at each end, by which the stones are slidden about, to and fro, over the wet and sanded decks; a most wearisome, dog-like, galley-slave employment.
- Used in the Middle of Sentence
Definition of ponderous in English Dictionary
- Part-of-Speech Hierarchy
- Adjectives
- Adjectives
Source: Wiktionary
Grammatically, this word "ponderous" is an adjective.